An investigator inspects the area near a surveillance camera on the roof of the Lord & Taylor store, which, an official said, is crucial in the investigation of the explosions near the Boston Marathon... more 
An investigator inspects the area near a surveillance camera on the roof of the Lord & Taylor store, which, an official said, is crucial in the investigation of the explosions near the Boston Marathon finish line, Thursday, April 18, 2013, in Boston. Boston City Council President Stephen Murphy, who said Wednesday he was briefed by Boston police, said investigators saw an image on surveillance footage they got from the department store near the finish line, and matched the findings with witness descriptions of someone leaving the scene. (AP Photo/Julio Cortez) less 
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Associated Press | Photo By Julio Cortez
Thu, Apr 18, 2013 3:50 PM EDT