Boston Marathon bombing

Associated Press
Medical workers aid injured people at the finish line of the 2013 Boston Marathon in Boston, Monday, April 15, 2013. Two bombs exploded near the finish line of the Boston Marathon on Monday, killing at least two people and injuring dozens of others (AP Photo/Charles Krupa)

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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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