Federal Bureau Of Investigation

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This image released by the FBI on Thursday, April 18, 2013, shows in a image from video what the FBI is calling suspect number 1 with a black hat walking with a backpack in Boston on Monday, April 15, 2013, before the explosions at the Boston Marathon. (AP Photo/FBI)

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** FILE ** This image from a Federal Bureau of Investigation and Department of Homeland Security joint bulletin issued to law enforcement and obtained by The Associated Press shows the remains of a pressure cooker that the FBI says was part of one of the bombs that exploded during the Boston Marathon. (AP Photo/FBI)

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President Obama talks on the phone with FBI Director Robert Mueller following explosions at the Boston Marathon. (Pete Souza/White House photo)

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The FBI has put documents from 1950 UFO sightings on its website. (FBI.gov)

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FBI Special Agent in Charge Richard DesLauriers (right) stands next to a poster that shows a Rembrandt painting and a reward during a news conference at FBI headquarters in Boston on Monday, March 18, 2013. The FBI believes it knows the identities of the thieves who stole artworks valued at up to $500 million from Boston's Isabella Stewart Gardner Museum more than two decades ago. Mr. DesLauriers says the thieves belong to a criminal organization based in New England and the Mid-Atlantic states. (AP Photo/Steven Senne)

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** FILE ** This undated photo provided by the FBI shows Jose Banks, one of two inmates who escaped from the Metropolitan Correctional Center in downtown Chicago Tuesday, Dec. 18, 2012. FBI spokeswoman Joan Hyde said Joseph "Jose" Banks, 37, was captured without incident Thursday Dec. 20, 2012. (AP Photo/FBI, File)

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This undated photo provided by the FBI shows Kenneth Conley, left and Jose Banks two inmates who escaped from the Metropolitan Correctional Center in downtown Chicago Tuesday, Dec. 18, 2012. (AP Photo/FBI,HOPD)

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FBI and local law enforcement officials search the home of Michael Fabini, brother of retired National Football League player Jason Fabini, on Dec. 6, 2012, at Cherry Hill Parkway in Fort Wayne, Ind. Federal, state and local officers with the Safe Streets Task Force raided a Fort Wayne property owned by Jason Fabini, a home owned by his brother, Michael Fabini, and five other area properties. FBI Special Agent David Crawford declined Friday, Dec. 7, 2012, to say why the properties were raided, saying only that there was “investigative activity” going on there. (Associated Press/The Journal Gazette, Swikar Patel)