Boston Marathon bombing

Associated Press
In this photo provided by The Daily Free Press and Kenshin Okubo, people react to an explosion at the 2013 Boston Marathon in Boston, Monday, April 15, 2013. Two explosions shattered the euphoria of the Boston Marathon finish line on Monday, sending authorities out on the course to carry off the injured while the stragglers were rerouted away from the smoking site of the blasts. (AP Photo/The Daily Free Press, Kenshin Okubo) MANDATORY CREDIT

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The day after the attack on the 2013 Boston Marathon, bombing suspect Dzhokhar Tsarnaev and Azamat Tazhayakov were hanging out on the UMass Dartmouth campus, surveillance video reveals. (AP)

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