FILE - This file photo released Friday, April 19, 2013 by the Federal Bureau of Investigation shows Boston Marathon bombing suspect Dzhokhar Tsarnaev. In court documents filed Monday, March 17, 2014, prosecutors said Tsarnaev should not be allowed to see autopsy photos that will not be used at his trial. They said allowing the man accused of killing them to see photos of their mutilated bodies "would violate the victims' rights to dignity and privacy and subject them to needless harm and suffering." (AP Photo/Federal Bureau of Investigation, File)
FILE - This photo provided by the FBI shows Paul Ciancia, 23. Ciancia, charged with fatally shooting a Transportation Security Administration screener and wounding three other people at Los Angeles International Airport, Nov. 1, 2013. Thousands of Los Angeles International Airport workers had no idea what to do when this gunman opened fire last year or how to help because they were inadequately trained to deal with an emergency, according to a union report obtained Friday March 14, 2014. (AP Photo/FBI, File)
National Edition News cover for March 14, 2014 - FBI blocked in corruption probe of Reid, Lee: Senate Majority Leader Harry Reid (top), Nevada Democrat, and Sen. Mike Lee, Utah Republican, are facing accusations of wrongdoing, but the Justice Department has thwarted FBI attempts to launch an investigation.
FILE - This is an undated file photo provided by the Federal Bureau of Investigation of Daniel Andreas San Diego, an animal rights activist. The FBI says agents are hunting in Hawaii for San Diego, the nation's most wanted domestic terrorism suspect. The FBI office in San Francisco said Wednesday, March 12, 2014, that the agency received "credible intelligence" that San Diego might be on the state's Big Island. Agents are searching for him on the island's eastern district of Puna and in the small town of Pahoa. San Diego is charged with exploding pipe bombs in front of two San Francisco Bay Area companies with ties to a lab that conducted animal experiments in 2003. (AP Photo/FBI, File)
This image made from the Federal Bureau of Investigation "Ten Most Wanted" section of the website on Wednesday, April 11, 2012 shows Eric Justin Toth. A former Washington private school teacher who was captured in Nicaragua after a year on the FBI's "Ten Most Wanted" fugitives list is scheduled to be sentenced in a child pornography case. Eric Toth's hearing is set for Tuesday in Washington. (AP Photo/FBI)
This photo provided by the Federal Bureau of Investigation shows Timothy Virts. Police searched Thursday for an 11-year-old girl who was reported missing after her mother was found slain in their home in Dundalk. Baltimore County Police believe the girl, Caitlyn Virts, is with her father, 38-year-old Virts, and they are concerned for her safety, department spokeswoman Elise Armacost said. (AP Photo/Federal Bureau of Investigation)
This combination of images released by the FBI on Thursday, April 18, 2013, show two images taken from surveillance video of Dzhokhar (left) and Tamerlan Tsarnaev (right) as they walk near each other through the crowd before the explosions at the Boston Marathon on Monday, April 15, 2013. (AP Photo/FBI)