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This undated photo provided by Meixu Lu shows Lingzi Lu in Boston. Boston University confirmed Wednesday, April 17, 2013, that Lingzi Lu, who was studying mathematics and statistics at the school and was due to receive her graduate degree in 2015, was among the people killed in the explosions at the finish line of the Boston Marathon Monday, April 15, 2013, in Boston. (AP Photo/Meixu Lu)

Victims of Boston bombing

The twin bombs at the Boston Marathon killed three people and wounded more than 170 on April 15, 2013. Here are some of their stories.

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