Boston Marathon bombing aftermath: Search for clues amid memorials

A note is left at a shrine to the victims of the Boston Marathon explosions in Boston, Massachussetts, April 17, 2013. (Lesley Clark/MCT via Getty Images)

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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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