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The 2012 Makhachkala attack occurred on 3 May 2012 after two suicide bombers detonated explosive-filled cars near a traffic police checkpoint in Makhachkala, a city in the republic of Dagestan, Russia, killing at least 13 people. More than 130 others were injured in the blasts, at least 67 of them seriously. Government sources speculated that the bombers may have been transporting TNT to a downtown location in anticipation of the annual May Day parade on May 9.