Cheikh Modibo Diarra, Mali’s Prime Minister, Resigns After Arrest

BAMAKO, Mali — Soldiers arrested Mali’s prime minister at his residence late Monday night, signaling new turmoil in a West African nation racked by military interference and an Islamist takeover in the north.

Associated Press

Prime Minister Cheikh Modibo Diarra appeared on state television and announced his government’s resignation on Tuesday.

Hours later, Prime Minister Cheikh Modibo Diarra appeared grim-faced on national television to announce his government’s resignation. A spokesman for soldiers who seized power earlier in the year — and later nominally relinquished it to Mr. Diarra — confirmed the prime minister’s arrest on Tuesday morning, accusing him of “playing a personal agenda” while the country faced a crisis in the north. The soldiers arrived at Mr. Diarra’s home around 11 p.m. Monday as he was preparing for a flight to Paris for a medical checkup, said the military spokesman, Bakary Mariko. The prime minister was taken to the military encampment at Kati, just outside Bamako, the capital, where Capt. Amadou Sanogo, the officer who led the March military coup, and others told him “there were proofs against him that he was calling for subversion,” Mr. Mariko said.

On Tuesday morning, the streets of Bamako appeared calm following what appeared to be the country’s second coup d’état in less than a year. But the new upheaval is likely to be considered a setback to Western efforts to help Mali regain control of territory lost to Qaeda-linked militants earlier in the year.

The West has watched with growing alarm as Islamist radicals have constructed a stronghold in the country’s vast north. The United Nations, regional African bodies, France and the United States have tried to aid the faltering Malian Army in a military strike to take back the lost north. Those efforts have so far not coalesced into a coherent plan, despite numerous meetings and United Nations resolutions. More meetings at the United Nations are planned for later this month.

The latest political turmoil in the capital will almost certainly slow down any campaign in the north, however. Already, the United States has expressed reluctance to provide too much direct military assistance, given the shakiness of the political order here. Those doubts are only likely to increase following the latest upheaval.

Mr. Diarra — appointed last spring as a caretaker prime minister until new elections could be organized — was known to disagree with Captain Sanogo on military policy.

He has been an advocate of immediate international military assistance to recapture the north from the Islamists. Captain Sanogo has rebuffed suggestions that the Malian military is incapable of handling the job on its own. Indeed, the captain for weeks resisted the notion that troops from other African nations should even approach the capital.

While Mr. Diarra has made the rounds of foreign capitals, pleading for help to fight the increasingly aggressive Islamists, military leaders have remained at the Kati base, grumbling.

That conflict was evident in the declarations of the military’s spokesman on Tuesday. “Since he has been in power, he has been working simply to position his own family,” Mr. Mariko said. “There has been a paralysis in government.”

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'Lincoln' leads Critics' Choice Awards nominees

LOS ANGELES (AP) — Film critics love "Lincoln." The historical drama earned a record-breaking 13 nominations for the Critics' Choice Movie Awards.

The Broadcast Film Critics Association announced the nominees for its 18th annual awards ceremony Tuesday in Los Angeles.

"Lincoln" beat the 12 nods earned by 2010's "Black Swan" with bids for director Steven Spielberg, star Daniel Day-Lewis and supporting actors Sally Field and Tommy Lee Jones, as well as cinematography, adapted screenplay, costume design, makeup, editing, art direction, score and acting ensemble.

"Les Miserables" follows with 11 nominations and "Silver Linings Playbook" has 10. "Life of Pi" earned nine nods. "Argo," ''Skyfall" and "The Master" each have seven.

Winners will be announced Jan. 10, 2013, at a ceremony set to be broadcast live on the CW network.

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Online:

www.criticschoice.com

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Rate of Childhood Obesity Falls in Several Cities

Jessica Kourkounis for The New York Times

At William H. Ziegler Elementary in Northeast Philadelphia, students are getting acquainted with vegetables and healthy snacks.

PHILADELPHIA — After decades of rising childhood obesity rates, several American cities are reporting their first declines.

The trend has emerged in big cities like New York and Los Angeles, as well as smaller places like Anchorage, Alaska, and Kearney, Neb. The state of Mississippi has also registered a drop, but only among white students.

“It’s been nothing but bad news for 30 years, so the fact that we have any good news is a big story,” said Dr. Thomas Farley, the health commissioner in New York City, which reported a 5.5 percent decline in the number of obese schoolchildren from 2007 to 2011.

The drops are small, just 5 percent here in Philadelphia and 3 percent in Los Angeles. But experts say they are significant because they offer the first indication that the obesity epidemic, one of the nation’s most intractable health problems, may actually be reversing course.

The first dips — noted in a September report by the Robert Wood Johnson Foundation — were so surprising that some researchers did not believe them.

Deanna M. Hoelscher, a researcher at the University of Texas, who in 2010 recorded one of the earliest declines — among mostly poor Hispanic fourth graders in the El Paso area — did a double-take. “We reran the numbers a couple of times,” she said. “I kept saying, ‘Will you please check that again for me?’ ”

Researchers say they are not sure what is behind the declines. They may be an early sign of a national shift that is visible only in cities that routinely measure the height and weight of schoolchildren. The decline in Los Angeles, for instance, was for fifth, seventh and ninth graders — the grades that are measured each year — between 2005 and 2010. Nor is it clear whether the drops have more to do with fewer obese children entering school or currently enrolled children losing weight. But researchers note that declines occurred in cities that have had obesity reduction policies in place for a number of years.

Though obesity is now part of the national conversation, with aggressive advertising campaigns in major cities and a push by Michelle Obama, many scientists doubt that anti-obesity programs actually work. Individual efforts like one-time exercise programs have rarely produced results. Researchers say that it will take a broad set of policies applied systematically to effectively reverse the trend, a conclusion underscored by an Institute of Medicine report released in May.

Philadelphia has undertaken a broad assault on childhood obesity for years. Sugary drinks like sweetened iced tea, fruit punch and sports drinks started to disappear from school vending machines in 2004. A year later, new snack guidelines set calorie and fat limits, which reduced the size of snack foods like potato chips to single servings. By 2009, deep fryers were gone from cafeterias and whole milk had been replaced by one percent and skim.

Change has been slow. Schools made money on sugary drinks, and some set up rogue drink machines that had to be hunted down. Deep fat fryers, favored by school administrators who did not want to lose popular items like French fries, were unplugged only after Wayne T. Grasela, the head of food services for the school district, stopped buying oil to fill them.

But the message seems to be getting through, even if acting on it is daunting. Josh Monserrat, an eighth grader at John Welsh Elementary, uses words like “carbs,” and “portion size.” He is part of a student group that promotes healthy eating. He has even dressed as an orange to try to get other children to eat better. Still, he struggles with his own weight. He is 5-foot-3 but weighed nearly 200 pounds at his last doctor’s visit.

“I was thinking, ‘Wow, I’m obese for my age,’ ” said Josh, who is 13. “I set a goal for myself to lose 50 pounds.”

Nationally, about 17 percent of children under 20 are obese, or about 12.5 million people, according to the Centers for Disease Control and Prevention, which defines childhood obesity as a body mass index at or above the 95th percentile for children of the same age and sex. That rate, which has tripled since 1980, has leveled off in recent years but has remained at historical highs, and public health experts warn that it could bring long-term health risks.

Obese children are more likely to be obese as adults, creating a higher risk of heart disease and stroke. The American Cancer Society says that being overweight or obese is the culprit in one of seven cancer deaths. Diabetes in children is up by a fifth since 2000, according to federal data.

“I’m deeply worried about it,” said Francis S. Collins, the director of the National Institutes of Health, who added that obesity is “almost certain to result in a serious downturn in longevity based on the risks people are taking on.”

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DealBook: 3 Men Arrested in Rate-Rigging Inquiry

10:24 a.m. | Updated LONDON – British authorities made the first arrests in the global investigation into interest-rate manipulation, an inquiry that has ensnared the world’s biggest banks.

The Serious Fraud Office of Britain said on Tuesday that it had arrested three people in connection with rate rigging. The three men, who are aged between 33 and 47 and are British citizens, were taken into custody by police in early morning raids at their houses on the outskirts of London.

One of the people is Thomas Hayes, a 33-year-old former trader at Citigroup and UBS, according to people with knowledge of the matter. At least one of the other two men worked for R P Martin, a British brokerage firm that previously surfaced in the Canadian investigation into rate manipulation, another person briefed on the matter said.

British criminal authorities typically make arrests at the early stages of an inquiry, and the actions do not necessarily mean the individuals will be charged with any wrongdoing. A Citigroup spokeswoman declined to comment. A UBS spokesman declined to comment. A lawyer for Mr. Hayes could not immediately be identified.

The arrests mark a new phase of the sprawling rate-rigging inquiry.

Regulators around the world are investigating more than a dozen big banks that help set benchmarks like the London interbank offered rate, or Libor. Such benchmark rates are used to determine the borrowing costs for trillions of dollars of financial products, including credit cards, student loans and mortgages.

In June, the British bank Barclays agreed to pay $450 million to settle charges that some of its traders attempted to manipulate Libor to bolster profits. Authorities also accused Barclays of submitting low rates to deflect concerns about its health during the financial crisis. The scandal prompted the resignations of top bank officials, including the chief executive, Robert E. Diamond Jr.

Libor Explained

Regulators are now pursuing a number of criminal and civil cases.

The Royal Bank of Scotland is talks with authorities. The bank said it would likely disclose fines before its next earnings report in February.

The Swiss bank UBS is close to finalizing a settlement deal with American and British authorities. The bank is expected to pay more than $450 million to settle claims that some employees reported false rates to increase its profit. When American authorities announce their case against UBS in the coming days, Mr. Hayes is expected to figure prominently, one of the officials said.

Mr. Hayes built his reputation as a trader at UBS. He worked at the Swiss bank from about 2006 to 2009, before departing for Citigroup.

But his career at Citi was short-lived. In 2010, the bank suspended him after he approached a London trading desk about improperly influencing the Yen-denominated Libor rates, a person briefed on the matter said. He was fired in September 2010, and the bank reported his suspected actions to authorities.

UBS also implicated Mr. Hayes to authorities, according to another person briefed on the matter. The Swiss bank discovered that Mr. Hayes worked with traders at other banks to influence rates, according to officials and court documents.

Mr. Hayes emerged in court documents this year filed by Canadian authorities. The documents — collected by Canada’s Competition Bureau, the country’s anti-trust authority – highlight an alleged scheme in which Mr. Hayes and other traders colluded to push Yen Libor rates up and down. The Canadian investigation, which spans conduct from 2007 to 2010, also referenced traders at JPMorgan Chase HSBC, Deutsche Bank and the Royal Bank of Scotland.

The traders, the documents said, at times corresponded via instant messages on Bloomberg machines. While the flurry of activity took place outside Canada, the trading affected financial contracts in the country that were pegged to Yen Libor.

“Traders at participants banks communicated with each other their desire to see a higher or lower Yen Libor to aid their trading positions,” the Canadian documents said.

The traders also relied on middlemen at brokerage firms “to use their influence” on other banks that set Libor, according to the documents. The brokers included employees at R P Martin, a person briefed on the matter said.

Under British law, Mr. Hayes and the other men can be held for 24 hours. The authorities can then apply for an extension if they need more time for questioning.

The Serious Fraud Office started a criminal investigation into Libor manipulation in July, in response to the furor over the rate-rigging scandal at Barclays. The criminal investigations by the British authorities and their counterparts at the Justice Department parallel similar civil inquiries by international authorities, including the Commodity Futures Trading Commission and the Financial Services Authority, the British regulator.

The arrests come as the agency tries to repair it reputation. In April, the new director of the Serious Fraud Office, David Green, pledged overhaul the office after a series of mistakes by the organization.

Legal professionals say the appointment is a step toward rejuvenating the agency, which has lacked significant firepower to police London’s financial services section. The Serious Fraud Office has been given extra resources by the British government to pursue a criminal investigation related to Libor.

“The S.F.O. works incredibly slowly,” said a defense lawyer representing individuals implicated in the Libor inquiry, who spoke on the condition of anonymity because of the ongoing investigation. “It’s not surprising that people have been arrested. But how long it will take to lead to criminal charges is another matter.”

Azam Ahmed contributed reporting.

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News Analysis: U.N. Envoy Rice Faulted for Rwanda Tie in Congo Conflict

Phil Moore/Agence France-Presse — Getty Images

Congolese soldiers re-entered the city of Goma last Monday.

WASHINGTON — Almost two decades after the Clinton administration failed to intervene in the genocide in Rwanda, the United States is coming under harsh criticism for not moving forcefully in another African crisis marked by atrocities and brutal killings, this time in Rwanda’s neighbor, the Democratic Republic of Congo.

While President Obama and Secretary of State Hillary Rodham Clinton have taken some of the blame, critics of the Obama administration’s Africa policy have focused on the role of Susan E. Rice, the United States ambassador to the United Nations and a leading contender to succeed Mrs. Clinton, in the administration’s failure to take action against the country they see as a major cause of the Congolese crisis, Rwanda.

Specifically, these critics — who include officials of human rights organizations and United Nations diplomats — say the administration has not put enough pressure on Rwanda’s president, Paul Kagame, to end his support for the rebel movement whose recent capture of the strategic city of Goma in Congo set off a national crisis in a country that has already lost more than three million people in more than a decade of fighting. Rwanda’s support is seen as vital to the rebel group, known as M23.

Support for Mr. Kagame and the Rwandan government has been a matter of American foreign policy since he led the Tutsi-dominated Rwandan Patriotic Front to victory over the incumbent government in July 1994, effectively ending the Rwandan genocide. But according to rights organizations and diplomats at the United Nations, Ms. Rice has been at the forefront of trying to shield the Rwandan government, and Mr. Kagame in particular, from international censure, even as several United Nations reports have laid the blame for the violence in Congo at Mr. Kagame’s door.

A senior administration official said Saturday that Ms. Rice was not freelancing, and that the American policy toward Rwanda and Congo was to work with all the countries in the area for a negotiated settlement to the conflict.

Aides to Ms. Rice acknowledge that she is close to Mr. Kagame and that Mr. Kagame’s government was her client when she worked at Intellibridge, a strategic analysis firm in Washington. Ms. Rice, who served as the State Department’s top African affairs expert in the Clinton administration, worked at the firm with several other former Clinton administration officials, including David J. Rothkopf, who was an acting under secretary in the Commerce Department; Anthony Lake, Mr. Clinton’s national security adviser; and John M. Deutch, who was director of the Central Intelligence Agency.

Payton Knopf, a spokesman for Ms. Rice, initially declined to comment on whether her work with Rwanda at Intellibridge affected her dealings with the country in her present job as an ambassador. But on Monday, Mr. Knopf said: “Ambassador Rice’s brief consultancy at Intellibridge has had no impact on her work at the United Nations. She implements the agreed policy of the United States at the U.N.”        

Two months ago, at a meeting with her French and British counterparts at the French Mission to the United Nations, according to a Western diplomat with knowledge of the meeting, Ms. Rice objected strongly to a call by the French envoy, Gerard Araud, for explicitly “naming and shaming” Mr. Kagame and the Rwandan government for its support of M23, and to his proposal to consider sanctions to pressure Rwanda to abandon the rebel group.

“Listen Gerard,” she said, according to the diplomat. “This is the D.R.C. If it weren’t the M23 doing this, it would be some other group.” The exchange was reported in Foreign Policy magazine last week.

A few weeks later, Ms. Rice again stepped in to protect Mr. Kagame. After delaying for weeks the publication of a United Nations report denouncing Rwanda’s support for the M23 and opposing any direct references to Rwanda in United Nations statements and resolutions on the crisis, Ms. Rice intervened to water down a Security Council resolution that strongly condemned the M23 for widespread rape, summary executions and recruitment of child soldiers. The resolution expressed “deep concern” about external actors supporting the M23. But Ms. Rice prevailed in preventing the resolution from explicitly naming Rwanda when it was passed on Nov. 20.

Mr. Knopf, the spokesman for Ms. Rice, said the view of the United States was that delicate diplomatic negotiations under way among Rwanda, Congo and Uganda could have been adversely affected if the Security Council resolution explicitly named Rwanda. “Working with our colleagues in the Security Council, the United States helped craft a strong resolution to reinforce the delicate diplomatic effort then getting under way in Kampala,” Mr. Knopf said.

The negotiations subsequently fell apart, and the M23 continued to make gains in eastern Congo. Last week, the M23 withdrew from Goma but left behind agents and remain in range of the city.

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Massive HP conference draws 10,000 attendees to ogle products, speakers, presentations

By Suzy Hansen

More than 10,000 customers, partners and attendees flocked to the Hewlett-Packard Discover conference in Frankfurt, Germany, this week to learn about HP's latest products, exchange ideas, swap business cards and basically examine whether HP can improve the way their companies are run. The event was held at Messe Frankfurt, one of the world's largest trade exhibition sites.

CEO Meg Whitman acknowledged in her speech on Tuesday that HP has gone through some rough times this past year. HP's stock price has been nearly halved during her tenure. Whitman, however, pointed out that HP has $120 billion in revenue and is the 10th-largest company in the United States. In Q4, HP has generated $4.1 billion in cash flow.

"We are the No. 1 or No. 2 provider in almost every market," Whitman told the crowd in Frankfurt.

Whitman emphasized  executives' increasing concerns about security and said that it will be addressed by "a new approach": HP's security portfolio, with Autonomy and Vertica, which helps "analyze and understand the context of these events." Executive Vice President of Enterprise Dave Donatelli spoke about converged infrastructure, or bringing together server, network and storage; their software-defined data centers; and their new servers, which "change the way servers have been defined." George Kadifa, executive vice president of software, said 94 of the top 100 companies use HP software. HP is the sixth-largest software company in the world, with 16,000 employees in 70 countries, Kadifa added.

Also at the conference was Jeffrey Katzenberg, CEO of DreamWorks and an old friend of Whitman's from their Disney days, who roused the crowd with a fun speech about his long relationship with HP. Katzenberg showed an old video of himself onstage with a lion, which nearly mauled him. This time, he appeared onstage with a guy in a lion suit. The lesson was to learn from past mistakes and move on.

"If I am smart enough to say 'scalable multicorps processing,' I am smart enough to not put myself onstage with a real lion again," he joked.

The Discover conference is a key vehicle for HP to show off products it's offering in the coming year. Among them were the latest ProLiant and Integrity servers, the 3PAR StoreServ 7000 and the StoreAll and StoreOnce storage systems. At the HP Labs section of the conference, attendees could learn about the cloud infrastructure or test HP's new ElitePad 900.

Throughout the three-day event, which saw attendance grow by 30 percent this year, attendees wandered the enormous halls, milling around displays, watching videos, listening to speeches and participating in workshops. People gathered on clustered couches and chatted with new acquaintances, frequently stopping to plug in their various devices and recharge themselves with coffee. With people coming from all over the world, you could hear many languages spoken, from Arabic to French to the most bewildering of them all: the language of technology. Despite the large crowds, it was hard not to notice there were very few women among the thousands in attendance. In fact, when asked about this phenomenon, one female HP employee said, "Trust me, you aren't the first person who has come up to me asking about this."

Indeed, the Discover conference was like a forest of men in suits. The few women stood out like rays of sunlight. 

Regardless of their presence at this conference, women are making big strides in information technology. Among the leaders are HP CEO Whitman, who also led eBay; Carly Fiorina, who ran HP before Whitman; Yahoo! CEO Marissa Mayer; and Facebook COO Sheryl Sandberg. Were the women at the Discover conference surprised by the low female turnout?

"No, for IT this is standard," said Stefanie, a 30-year-old product manager from Germany. "Many are afraid of all the technical stuff, and you have to prove that you are capable of it. You get more women in retail and distribution but not in high-tech areas, at least not in Europe. In America there are more women in management positions and in general."

Americans might assume that Europe, with its generous social programs that include free daycare, enables more women to ascend the corporate ladder. But that still doesn't mean that a woman trying to balance a high-tech career and a family is always accepted in European society.

"There is still a lot of emphasis on the family," Stefanie said. "It's easier to move up in the U.S., where there is a culture of 'having it all.' It's quite a fight to get there here."

Still, the IT industry might seem inhospitable to women. Could this male-dominated profession be male-dominant because women have a hard time breaking in?

Stefanie disagreed. "No, they actually like working with women," she said. "They want to."

One male conference attendee, who asked not to be named, was less certain.

"There's a lot of ego and testosterone," he said. "It can't be easy" for women.

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Singer feared dead in Mexican plane crash

MONTERREY, Mexico (AP) — Mexico's music world mourned Jenni Rivera, the U.S.-born singer presumed killed in a plane crash whose soulful voice and openness about her personal troubles had made her a Mexican-American superstar.

Authorities have not confirmed her death, but Rivera's relatives in the U.S. say they have few doubts that she was on the Learjet 25 that disintegrated on impact Sunday in rugged territory in Nuevo Leon state in northern Mexico.

"My son Lupillo told me that effectively it was Jenni's plane that crashed and that everyone on board died," her father, Pedro Rivera, told dozens of reporters gathered in front of his Los Angeles-area home. "I believe my daughter's body is unrecognizable."

He said that his son would fly to Monterrey Monday.

Messages of condolence poured in from fellow musicians and celebrities.

Mexican songstress and actress Lucero wrote on her Twitter account: "What terrible news! Rest in peace ... My deepest condolences for her family and friends." Rivera's colleague on the Mexican show "The Voice of Mexico," pop star Paulina Rubio, said on her Twitter account: "My friend! Why? There is no consolation. God, please help me!"

Born in Long Beach, California, Rivera was at the peak of her career as perhaps the most successful female singer in grupero, a male-dominated regional style influenced by the norteno, cumbia and ranchero styles.

A 43-year-old mother of five children and grandmother of two, the woman known as the "Diva de la Banda" was known for her frank talk about her struggles to give a good life to her children despite a series of setbacks.

She was recently divorced from her third husband, was once detained at a Mexico City airport with tens of thousands of dollars in cash, and she publicly apologized after her brother assaulted a drunken fan who verbally attacked her in 2011.

Her openness about her personal troubles endeared her to millions in the U.S. and Mexico.

"I am the same as the public, as my fans," she told The Associated Press in an interview last March.

Rivera sold 15 million records, and recently won two Billboard Mexican Music Awards: Female Artist of the Year and Banda Album of the Year for "Joyas prestadas: Banda." She was nominated for Latin Grammys in 2002, 2008 and 2011.

Transportation and Communications Minister Gerardo Ruiz Esparza said "everything points toward" the wreckage belonging to the plane carrying Rivera and six other people to Toluca, outside Mexico City, from Monterrey, where the singer had just given a concert.

"There is nothing recognizable, neither material nor human" in the wreckage found in the state of Nuevo Leon, Ruiz Esparza said. The impact was so powerful that the remains of the plane "are scattered over an area of 250 to 300 meters. It is almost unrecognizable."

A mangled California driver's license with Rivera's name and picture was found in the crash site debris.

No cause was given for the plane's crash, but its wreckage was found near the town of Iturbide in Mexico's Sierra Madre Oriental, where the terrain is very rough.

The Learjet 25, number N345MC, took off from Monterrey at 3:30 a.m. local time and was reported missing about 10 minutes later. It was registered to Starwood Management of Las Vegas, Nevada, according to FAA records. It was built in 1969 and had a current registration through 2015.

Also believed aboard the plane were her publicist, Arturo Rivera, her lawyer, makeup artist and the flight crew.

Though drug trafficking was the theme of some of her songs, she was not considered a singer of "narco corridos," or ballads glorifying drug lords like other groups, such as Los Tigres del Norte. She was better known for singing about her troubles in love and disdain for men.

Her parents were Mexicans who had migrated to the United States. Two of her five brothers, Lupillo and Juan Rivera, are also well-known singers of grupero music.

She studied business administration and formally debuted on the music scene in 1995 with the release of her album "Chacalosa". Due to its success, she recorded two more independent albums, "We Are Rivera" and "Farewell to Selena," a tribute album to slain singer Selena that helped expand her following.

At the end of the 1990s, Rivera was signed by Sony Music and released two more albums. But widespread success came for her when she joined Fonovisa and released her 2005 album titled "Partier, Rebellious and Daring."

Besides being a singer, she is also a businesswoman and actress, appearing in the indie film Filly Brown, which was shown at the Sundance Film Festival, as the incarcerated mother of Filly Brown.

She was filming the third season of "I love Jenni," which followed her as she shared special moments with her children and as she toured through Mexico and the United States. She also has the reality shows: "Jenni Rivera Presents: Chiquis and Raq-C" and her daughter's "Chiquis 'n Control."

In 2009, she was detained at the Mexico City airport when she declared $20,000 in cash but was really carrying $52,167. She was taken into custody. She said it was an innocent mistake and authorities gave her the benefit of the doubt and released her.

In 2011, her brother Juan assaulted a drunken fan at a popular fair in Guanajuato. In the face of heavy criticism among her fans and on social networks, Rivera publicly apologized for the incident during a concert in Mexico City, telling her fans: "Thank you for accepting me as I am, with my virtues and defects."

On Saturday night, Rivera had given a concert before thousands of fans in Monterrey. After the concert she gave a press conference during which she spoke of her emotional state following her recent divorce from former Major League Baseball pitcher Esteban Loaiza, who played for teams including the New York Yankees and Los Angeles Dodgers.

"I can't get caught up in the negative because that destroys you. Perhaps trying to move away from my problems and focus on the positive is the best I can do. I am a woman like any other and ugly things happen to me like any other woman," she said Saturday night. "The number of times I have fallen down is the number of times I have gotten up."

Rivera had announced in October that she was divorcing Loaiza after two years of marriage.

There have been several high-profile crashes involving Learjets, known as swift, longer-distance passenger aircraft popular with corporate executives, entertainers and government officials.

A Learjet carrying pro-golfer Payne Stewart and five others crashed in northeastern South Dakota in 1999. Investigators said the plane lost cabin pressure and all on board died after losing consciousness for lack of oxygen. The aircraft flew for several hours on autopilot before running out of fuel and crashing in a corn field.

Former Blink 182 drummer Travis Barker was severely injured in a 2008 Learjet crash in South Carolina that killed four people.

That same year, a Learjet slammed into rush-hour traffic in a posh Mexico City neighborhood, killing Mexico's No. 2 government official, Interior Secretary Juan Camilo Mourino, and eight others on the plane, plus five people on the ground.

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Associated Press Writer Galia Garcia-Palafox and Olga R. Rodriguez contributed to this report from Mexico City.

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A Breakthrough Against Leukemia Using Altered T-Cells

PHILIPSBURG, Pa. — Emma Whitehead has been bounding around the house lately, practicing somersaults and rugby-style tumbles that make her parents wince.

It is hard to believe, but last spring Emma, then 6, was near death from leukemia. She had relapsed twice after chemotherapy, and doctors had run out of options.

Desperate to save her, her parents sought an experimental treatment at the Children’s Hospital of Philadelphia, one that had never before been tried in a child, or in anyone with the type of leukemia Emma had. The experiment, in April, used a disabled form of the virus that causes AIDS to reprogram Emma’s immune system genetically to kill cancer cells.

The treatment very nearly killed her. But she emerged from it cancer-free, and about seven months later is still in complete remission. She is the first child and one of the first humans ever in whom new techniques have achieved a long-sought goal — giving a patient’s own immune system the lasting ability to fight cancer.

Emma had been ill with acute lymphoblastic leukemia since 2010, when she was 5, said her parents, Kari and Tom. She is their only child.

She is among just a dozen patients with advanced leukemia to have received the experimental treatment, which was developed at the University of Pennsylvania. Similar approaches are also being tried at other centers, including the National Cancer Institute and Memorial Sloan-Kettering Cancer Center in New York.

“Our goal is to have a cure, but we can’t say that word,” said Dr. Carl June, who leads the research team at the University of Pennsylvania. He hopes the new treatment will eventually replace bone-marrow transplantation, an even more arduous, risky and expensive procedure that is now the last hope when other treatments fail in leukemia and related diseases.

Three adults with chronic leukemia treated at the University of Pennsylvania have also had complete remissions, with no signs of disease; two of them have been well for more than two years, said Dr. David Porter. Four adults improved but did not have full remissions, and one was treated too recently to evaluate. A child improved and then relapsed. In two adults, the treatment did not work at all. The Pennsylvania researchers were presenting their results on Sunday and Monday in Atlanta at a meeting of the American Society of Hematology.

Despite the mixed results, cancer experts not involved with the research say it has tremendous promise, because even in this early phase of testing it has worked in seemingly hopeless cases. “I think this is a major breakthrough,” said Dr. Ivan Borrello, a cancer expert and associate professor of medicine at the Johns Hopkins University School of Medicine.

Dr. John Wagner, the director of pediatric blood and marrow transplantation at the University of Minnesota, called the Pennsylvania results “phenomenal” and said they were “what we’ve all been working and hoping for but not seeing to this extent.”

A major drug company, Novartis, is betting on the Pennsylvania team and has committed $20 million to building a research center on the university’s campus to bring the treatment to market.

Hervé Hoppenot, the president of Novartis Oncology, called the research “fantastic” and said it had the potential — if the early results held up — to revolutionize the treatment of leukemia and related blood cancers. Researchers say the same approach, reprogramming the patient’s immune system, may also eventually be used against tumors like breast and prostate cancer.

To perform the treatment, doctors remove millions of the patient’s T-cells — a type of white blood cell — and insert new genes that enable the T-cells to kill cancer cells. The technique employs a disabled form of H.I.V. because it is very good at carrying genetic material into T-cells. The new genes program the T-cells to attack B-cells, a normal part of the immune system that turn malignant in leukemia.

The altered T-cells — called chimeric antigen receptor cells — are then dripped back into the patient’s veins, and if all goes well they multiply and start destroying the cancer.

The T-cells home in on a protein called CD-19 that is found on the surface of most B-cells, whether they are healthy or malignant.

A sign that the treatment is working is that the patient becomes terribly ill, with raging fevers and chills — a reaction that oncologists call “shake and bake,” Dr. June said. Its medical name is cytokine-release syndrome, or cytokine storm, referring to the natural chemicals that pour out of cells in the immune system as they are being activated, causing fevers and other symptoms. The storm can also flood the lungs and cause perilous drops in blood pressure — effects that nearly killed Emma.

Steroids sometimes ease the reaction, but they did not help Emma. Her temperature hit 105. She wound up on a ventilator, unconscious and swollen almost beyond recognition, surrounded by friends and family who had come to say goodbye.

But at the 11th hour, a battery of blood tests gave the researchers a clue as to what might help save Emma: her level of one of the cytokines, interleukin-6 or IL-6, had shot up a thousandfold. Doctors had never seen such a spike before and thought it might be what was making her so sick.

Dr. June knew that a drug could lower IL-6 — his daughter takes it for rheumatoid arthritis. It had never been used for a crisis like Emma’s, but there was little to lose. Her oncologist, Dr. Stephan A. Grupp, ordered the drug. The response, he said, was “amazing.”

Within hours, Emma began to stabilize. She woke up a week later, on May 2, the day she turned 7; the intensive-care staff sang “Happy Birthday.”

Since then, the research team has used the same drug, tocilizumab, in several other patients.

In patients with lasting remissions after the treatment, the altered T-cells persist in the bloodstream, though in smaller numbers than when they were fighting the disease. Some patients have had the cells for years.

Dr. Michel Sadelain, who conducts similar studies at the Sloan-Kettering Institute, said: “These T-cells are living drugs. With a pill, you take it, it’s eliminated from your body and you have to take it again.” But T-cells, he said, “could potentially be given only once, maybe only once or twice or three times.”

The Pennsylvania researchers said they were surprised to find any big drug company interested in their work, because a new batch of T-cells must be created for each patient — a far cry from the familiar commercial strategy of developing products like Viagra or cholesterol medicines, in which millions of people take the same drug.

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Fed Likely to Sustain Bond-Buying Program to Stimulate Growth

WASHINGTON — The Federal Reserve is widely expected to announce on Wednesday that it will continue buying Treasury securities to stimulate growth in the new year.

The Fed’s public declaration in September that it would buy bonds until the outlook for the labor market “improved substantially” has cleared away much of the uncertainty and controversy that usually precedes such announcements.

The economic recovery remains lackluster and millions are looking for work. But while some analysts question the central bank’s ability to improve the situation, few doubt that the Fed, under its chairman, Ben S. Bernanke, is determined to keep trying.

Indeed, while Fed officials continue to warn that a failure to avert scheduled tax increases and spending cuts next year would overwhelm their efforts and plunge the economy back into recession, they have also said that even if Congress and the White House negotiate a compromise, the Fed’s efforts would continue.

“I am not prepared to say we are remotely close to substantial improvement on the employment front,” Dennis P. Lockhart, president of the Federal Reserve Bank of Atlanta, said in a recent speech. “I expect that continued aggressive use of balance sheet monetary tools will be appropriate and justified by economic conditions for some time, even if fiscal cliff issues are properly addressed.”

The remarks were particularly significant because Mr. Lockhart is among the moderate members of the Federal Open Market Committee whose support Mr. Bernanke invested months in winning before starting the new policy.

With the direction of policy clearly set, debate has turned to the details. The Fed, whose policy-making committee is meeting on Tuesday and Wednesday, still must determine what to buy and how much to spend, and officials continue to debate the best way to describe when the agency is likely to stop buying.

In making those decisions, the Fed must balance its conviction that buying bonds reduces borrowing costs for businesses and consumers against concerns the purchases might disrupt financial markets or inhibit its control of inflation.

Analysts say the immediate answer is likely to be more of the same. The Fed currently buys $40 billion of mortgage-backed securities and $45 billion of Treasury securities a month. Officials highlighted that $85 billion figure in September, and have indicated since that it remained their rough target.

“It would be odd for them to disappoint the expectations that they have created themselves,” Kris Dawsey of Goldman Sachs wrote in a note to clients predicting that the Fed would maintain both the dollar amount and the division. Other analysts have suggested the Fed might slightly decrease the total amount of purchases, to $80 billion, or increase the share of mortgage securities.

The Fed is unlikely to announce a new timetable this week, analysts said. The committee has said that it does not plan to raise interest rates before the middle of 2015, and that it will stop buying bonds before it starts raising rates.

Many officials on the 12-member committee — perhaps even the majority — would prefer to substitute economic objectives for guidance set by the calendar. The Fed’s ability to reduce borrowing costs derives in part from persuading investors that interest rates will remain low. Telling investors how the economic situation must change in order to warrant a change in policy could be more convincing, and therefore more potent, than simply publishing an estimated endpoint, these officials say.

But an account of the committee’s previous meeting, in late October, showed that officials remained divided about which economic objectives to use.

The most vocal proponent of focusing on economic goals, Charles L. Evans, president of the Federal Reserve Bank of Chicago, said last month that the Fed should declare its intent to keep short-term interest rates near zero until the unemployment rate fell below 6.5 percent, provided that the rate of inflation did not exceed 2.5 percent.

“I believe we have the ability to go even further in reassuring financial markets and the general public that policy will stay appropriately accommodative,” Mr. Evans said in advocating the change during a speech in Toronto.

Other officials have misgivings about placing such emphasis on any single economic indicator, or on the unemployment rate in particular.

The discussions are moving slowly, in part because it is not clear the changes being contemplated would have significant benefits. The targets the Fed is considering closely resemble its own past practice, meaning the new thresholds would tend to reinforce rather than shift expectations.

Lou Crandall, chief economist at the research firm Wrightson ICAP, noted in a recent analysis that the unemployment rate exceeded 7 percent in the mid-1980s and again in the early 1990s, and in both cases the Fed waited until the rate fell well into the 6 percent range before it began to raise interest rates.

The relative complacency of Fed officials also reflects their judgment that the mortgage-bond purchases announced in September are working. Average interest rates on 30-year mortgages are at the lowest levels on record, averaging 3.35 percent in November, according to Freddie Mac’s regular survey.

“This is solid evidence that our policy has been and continues to be effective — though it is certainly not all-powerful in current circumstances,” William C. Dudley, president of the Federal Reserve Bank of New York, said last week.

To continue the companion purchases of Treasury securities, the Fed will need to change its approach. It is now buying long-term securities with proceeds from the sale of short-term securities, but it is running out of inventory to sell.

The most likely alternative is to create money by crediting the accounts of banks that sell bonds to the Fed, the same method now being used to buy mortgage bonds and also to finance earlier rounds of the Fed’s so-called quantitative easing.

The Fed has repeatedly overestimated the health of the economy and the impact of its efforts. This time, officials have promised to maintain their efforts even as the economy shows signs of improvement. But they are once again sounding notes of cautious optimism about the coming year — if Washington does not interfere.

A budget deal reducing deficits in the long term, Mr. Bernanke said in November, “could help make the new year a very good one for the American economy.”

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Banks Face a Huge Reckoning in the Mortgage Mess

The nation’s largest banks are facing a fresh torrent of lawsuits asserting that they sold shoddy mortgage securities that imploded during the financial crisis, potentially adding significantly to the tens of billions of dollars the banks have already paid to settle other cases.

Regulators, prosecutors, investors and insurers have filed dozens of new claims against Bank of America, JPMorgan Chase, Wells Fargo, Citigroup and others, related to more than $1 trillion worth of securities backed by residential mortgages.

Estimates of potential costs from these cases vary widely, but some in the banking industry fear they could reach $300 billion if the institutions lose all of the litigation. Depending on the final price tag, the costs could lower profits and slow the economic recovery by weakening the banks’ ability to lend just as the housing market is showing signs of life.

The banks are battling on three fronts: with prosecutors who accuse them of fraud, with regulators who claim that they duped investors into buying bad mortgage securities, and with investors seeking to force them to buy back the soured loans.

“We are at an all-time high for this mortgage litigation,” said Christopher J. Willis, a lawyer with Ballard Spahr.

Efforts by the banks to limit their losses could depend on the outcome of one of the highest-stakes lawsuits to date — the $200 billion case that the Federal Housing Finance Agency, which oversees the housing twins Fannie Mae and Freddie Mac, filed against 17 banks last year, claiming that they duped the mortgage finance giants into buying shaky securities.

Last month, lawyers for some of the nation’s largest banks descended on a federal appeals court in Manhattan to make their case that the agency had waited too long to sue. A favorable ruling could overturn a decision by Judge Denise L. Cote, who is presiding over the litigation and has so far rejected virtually every defense raised by the banks, and would be cheered in bank boardrooms. It could also allow the banks to avoid federal housing regulators’ claims.

At the same time, though, some major banks are hoping to reach a broad settlement with housing agency officials, according to several people with knowledge of the talks. Although the negotiations are at a very tentative stage, the banks are broaching a potential cease-fire.

As the housing market and the nation’s economy slowly recover from the 2008 financial crisis, Wall Street is vulnerable on several fronts, including tighter regulations assembled in the aftermath of the crisis and continuing investigations into possible rigging of a major international interest rate. But the mortgage lawsuits could be the most devastating and expensive, bank analysts say.

“All of Wall Street has essentially refused to deal with the real costs of the litigation that they are up against,” said Christopher Whalen, a senior managing director at Tangent Capital Partners. “The real price tag is terrifying.”

Anticipating painful costs from mortgage litigation, the five major sellers of mortgage-backed securities set aside $22.5 billion as of June 30 just to cushion themselves against demands that they repurchase soured loans from trusts, according to an analysis by Natoma Partners.

But in the most extreme situation, the litigation could empty even more well-stocked reserves and weigh down profits as the banks are forced to pay penance for the subprime housing crisis, according to several senior officials in the industry.

There is no industrywide tally of how much banks have paid since the financial crisis to put the mortgage litigation behind them, but analysts say that future settlements will dwarf the payouts so far. That is because banks, for the most part, have settled only a small fraction of the lawsuits against them.

JPMorgan Chase and Credit Suisse, for example, agreed last month to settle mortgage securities cases with the Securities and Exchange Commission for $417 million, but still face billions of dollars in outstanding claims.

Bank of America is in the most precarious position, analysts say, in part because of its acquisition of the troubled subprime lender Countrywide Financial.

Last year, Bank of America paid $2.5 billion to repurchase troubled mortgages from Fannie Mae and Freddie Mac, and $1.6 billion to Assured Guaranty, which insured the shaky mortgage bonds.

But in October, federal prosecutors in New York accused the bank of perpetrating a fraud through Countrywide by churning out loans at such a fast pace that controls were largely ignored. A settlement in that case could reach well beyond $1 billion because the Justice Department sued the bank under a law that could allow roughly triple the damages incurred by taxpayers.

Bank of America’s attempts to resolve some mortgage litigation with an umbrella settlement have stalled. In June 2011, the bank agreed to pay $8.5 billion to appease investors, including the Federal Reserve Bank of New York and Pimco, that lost billions of dollars when the mortgage securities assembled by the bank went bad. But the settlement is in limbo after being challenged by investors. Kathy D. Patrick, the lawyer representing investors, has said she will set her sights on Morgan Stanley and Wells Fargo next.

Of the more than $1 trillion in troubled mortgage-backed securities remaining, Bank of America has more than $417 billion from Countrywide alone, according to an analysis of lawsuits and company filings. The bank does not disclose the volume of its mortgage litigation reserves.

“We have resolved many Countrywide mortgage-related matters, established large reserves to address these issues and identified a range of possible losses beyond those reserves, which we believe adequately addresses our exposures,” said Lawrence Grayson, a spokesman for Bank of America.

Adding to the legal fracas, the New York attorney general, Eric T. Schneiderman, accused Credit Suisse last month of perpetrating an $11.2 billion fraud by deceiving investors into buying shoddy mortgage-backed securities. According to the complaint, the bank dismissed flaws in the loans packaged into securities even while assuring investors that the quality was sound. The bank disputes the claims.

It is the second time that Mr. Schneiderman — who is also co-chairman of the Residential Mortgage-Backed Securities Working Group, created by President Obama in January — has taken aim at Wall Street for problems related to the subprime mortgage morass. In October, he filed a civil suit in New York State Supreme Court against Bear Stearns & Company, which JPMorgan Chase bought in 2008. The complaint claims that Bear Stearns and its lending unit harmed investors who bought mortgage securities put together from 2005 through 2007. JPMorgan denies the allegations.

Another potentially costly headache for the banks are the demands from a number of private investors who want the banks to buy back securities that violated representations and warranties vouching for the loans.

JPMorgan Chase told investors that as of the second quarter of this year, it was contending with more than $3.5 billion in repurchase demands. In the same quarter, it received more than $1.5 billion in fresh demands. Bank of America reported that as of the second quarter, it was dealing with more than $22 billion in unresolved demands, more than $8 billion of which were received during that quarter.

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