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Boston Marathon bombing

Associated Press
People react as an explosion goes off near the finish line of the 2013 Boston Marathon in Boston, Monday, April 15, 2013. Two explosions went off at 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 Boston Globe, David L Ryan)  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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