Federal Bureau Of Investigation

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D.C. Mayor Adrian M. Fenty (second from right); Joseph Persichini Jr., assistant director in charge of the FBI's Washington field office (right); Metropolitan Police Chief Cathy L. Lanier; U.S. Attorney Jeffrey Taylor (second from left) and Detective Todd Williams attend a press conference on March 3, 2009, at which it was announced that an arrest warrant had been issued in the Levy case. (The Washington Times)

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This undated photo provided by the Federal Bureau of Investigation shows Zahra Clare Baker, a 10-year-old North Carolina hearing-impaired girl with a prosthetic leg who is missing. The girl was last seen by her stepmother at 2:30 a.m. Saturday, Oct. 9, 2010. A fire was reported in the Bakers' backyard about 5 a.m.

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Attorney General Eric H. Holder Jr. (left), accompanied by U.S. Attorney Rosa Emilia Rodriguez-Velez (right) of the District of Puerto Rico and FBI Executive Director Shawn Henry, answers questions during a news conference at the Justice Department in Washington on Wednesday, Oct. 6, 2010. Earlier in the day, FBI agents arrested scores of Puerto Rican police officers for allegedly aiding drug dealers. (AP Photo/Haraz N. Ghanbari)

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Luqman Ameen Abdullah, imam of Masjid Al-Haqq Mosque in Detroit, was found to have shot first before being killed by FBI agents last year in Dearborn, Mich. (Associated Press)

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Associated Press Andy Stern, seen here in October 2009 while still president of the Service Employees International Union, is said to be the subject of an FBI corruption probe.

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"How do we develop the team between Department of Homeland Security, FBI, Cyber Command and others to work as a team to defend the nation in cyberspace?" asked Gen. Keith Alexander as he testifies on Capitol Hill on Thursday before the House Armed Services Committee hearing on cyberspace operations. (Associated Press)

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PUGNACIOUS: Former Illinois Gov. Rod R. Blagojevich (left) was convicted in a Chicago federal court on Tuesday on one felony count of lying to the FBI. The jury could not reach on a verdict on 23 other counts. (Associated Press)

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Former Illinois Gov. Rod R. Blagojevich talks defiantly to the news media at the federal court building in Chicago on Tuesday, with wife Patti next to him, after being convicted on one felony count of lying to the FBI. But prosecutors said they would retry him on the 23 other corruption and fraud charges. (Associated Press)

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Adnan Shukrijumah, 35, is a suspected al Qaeda operative who lived for more than 15 years in the U.S. The FBI says he has become chief of the terror network's global operations. (FBI via Associated Press)

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Adnan G. Shukrijumah. is seen in these artists renderings by the FBI and made available to the Associated Press Aug. 2, 2010. (AP Photo/FBI,HO)

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Adnan Shukrijumah, 35, is shown in these undated images provided by the FBI. The suspected al Qaeda operative who lived for more than 15 years in the U.S. has become chief of the terror network's global operations, the FBI says, marking the first time a leader so intimately familiar with American society has been placed in charge of planning attacks. (AP Photo/FBI)

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FBI Director Robert S. Mueller III testifies on Capitol Hill in Washington on Wednesday, July 28, 2010, at the Senate Judiciary Committee hearing on FBI oversight. (AP Photo/Manuel Balce Ceneta)

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Thus undated handout photo provided by the FBI shows Adnan Shukrijumah. Authorities believe that Shukrijumah met with one of the would-be suicide bombers in a plot to strike the New York subway system last year. Intelligence officials believe Shukrijumah, 34, is one of the top candidates to be al Qaeda's next head of external operations, the man in charge of planning attacks worldwide. The U.S. has offered up to $5 million for information leading to his capture. (AP Photo/FBI)

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FBI agents gather in front of the two-story residence in Yonkers, N.Y., where two suspected Russian secret agents Vicky Pelaez and a man known as "Juan Lazaro" were arrested on Monday June 28, 2010. The FBI has arrested 10 people for allegedly serving for years as secret agents of Russia's intelligence service, the SVR, with the goal of penetrating U.S. government policymaking circles. (AP Photo/The Journal News, Shawn Cohen)

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** FILE ** Najibullah Zazi arrives at the offices of the FBI in Denver for questioning on Sept. 17, 2009. (AP Photo/Ed Andrieski, File)

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** FILE ** Adam Gadahn, the American-born al Qaeda spokesman seen in these undated file photos released by the FBI, called on Muslims serving in the U.S. armed forces to emulate the Army major charged with killing 13 people in Fort Hood. (AP Photo/FBI-released photos, File)