Boston Police Commissioner Edward Davis is applauded by former Sen. Joesph Lieberman, I-Conn., as he is introduced before testifying at the House Homeland Security Committee 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 is applauded by former Sen. Joesph Lieberman, I-Conn., as he is introduced before testifying at the House Homeland Security Committee 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 is applauded by former Sen. Joesph Lieberman, I-Conn., as he is introduced before testifying at the House Homeland Security Committee 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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