The photos depict one man in a dark baseball cap and the other in a white cap worn backward. The men were seen walking one behind the other in the crowd, and the one in the white hat was seen setting down a backpack at the site of the second explosion, said Richard DesLauriers, FBI agent in charge in Boston.
By Adam Geller and Denise Lavoie, Associated Press
, April 18, 2013
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