Boston Police Commissioner Edward Davis testifies before the House Homeland Security Committee at a hearing on "The Boston Bombings: A First Look," on Capitol Hill in Washington, Thursday, May 9, 2013. (AP Photo/Susan Walsh)

Associated Press
Boston Police Commissioner Edward Davis testifies before the House Homeland Security Committee at a hearing on "The Boston Bombings: A First Look," on Capitol Hill in Washington, Thursday, May 9, 2013. (AP Photo/Susan Walsh)
Boston Police Commissioner Edward Davis testifies before the House Homeland Security Committee at a hearing on "The Boston Bombings: A First Look," on Capitol Hill in Washington, Thursday, May 9, 2013. (AP Photo/Susan Walsh)
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