FILE - This file 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. Rep. Michael McCaul, the chairman of the House Homeland Security Committee, says he believes the Boston Marathon bombing suspects had some training in carrying out their attack. McCaul is citing the type of device used in the attack, the shrapnel-packed pressure-cooker bombs, and the weapons' sophistication as signs of training. (AP Photo/FBI, File)

Associated Press
FILE - This file 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. Rep. Michael McCaul, the chairman of the House Homeland Security Committee, says he believes the Boston Marathon bombing suspects had some training in carrying out their attack. McCaul is citing the type of device used in the attack, the shrapnel-packed pressure-cooker bombs, and the weapons' sophistication as signs of training. (AP Photo/FBI, File)
FILE - This file 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. Rep. Michael McCaul, the chairman of the House Homeland Security Committee, says he believes the Boston Marathon bombing suspects had some training in carrying out their attack. McCaul is citing the type of device used in the attack, the shrapnel-packed pressure-cooker bombs, and the weapons' sophistication as signs of training. (AP Photo/FBI, File)
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