Police officers walk on Boylston Street near the finish line of Monday's Boston Marathon explosions, which killed at least three and injured more than 140, Thursday, April 18, 2013, in Boston. (AP Photo/Matt Rourke)

Associated Press
Police officers walk on Boylston Street near the finish line of Monday's Boston Marathon explosions, which killed at least three and injured more than 140, Thursday, April 18, 2013, in Boston. (AP Photo/Matt Rourke)
Police officers walk on Boylston Street near the finish line of Monday's Boston Marathon explosions, which killed at least three and injured more than 140, Thursday, April 18, 2013, in Boston. (AP Photo/Matt Rourke)
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