Federal Bureau Of Investigation

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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)