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Victims of the Boston Marathon bombings

Authorities say three people were killed in the bombings at the finish line of the 2013 Boston Marathon. The victims have been identified as: Krystle Campbell, 29, of Medford, Mass.; Martin Richard, 8, a resident of the Dorchester neighborhood of Boston; and Lu Lingzi, a Boston University graduate student originally from Shenyang. The bombings suspects fatally shot MIT officer Sean Collier and severely wounded MBTA officer Richard Donohue on April 18, 2013 .