Boston Marathon bombing aftermath: Search for clues amid memorials

Associated Press
Jillian Blenis, 30, of Boston, reacts while stopping at a makeshift memorial, Wednesday, April 17, 2013, in Boston. The city continues to cope following Monday's explosions near the finish line of the Boston Marathon. (AP Photo/Julio Cortez)

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Authorities have reviewed countless photo and video evidence provided by the public as well as surveillance video from businesses near the finish line to aid their investigation into the twin bombs that exploded at the Boston Marathon on Monday. The crime scene also has been flooded with tributes for the victims.

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