Federal Bureau Of Investigation

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Aaron Alexis, identified by FBI as the Navy Shipyard shooter.

This pair of file photos shows Stephen "The Rifleman" Flemmi, left, on Sept. 22, 2008, as he testified in a Miami court in the murder trial of former FBI agent John Connolly; and James "Whitey" Bulger, right, in a June 23, 2011 booking photo provided by the U.S. Marshals Service. (AP Photos/J. Pat Carter and U.S. Marshals Service, File)

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FBI and police officials brief Massachusetts Gov. Deval Patrick and Boston Mayor Tom Menino. (Sgt: Sean Murphy)

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FBI director nominee James B. Comey Jr. knocked down the notion that federal judges on the Foreign Intelligence Surveillance Court rubber stamp surveillance requests during testimony Tuesday before the Senate Judiciary Committee. (Associated Press)