8 of 22: Police officers gather outside Luby's Cafeteria in Killeen, Texas, at the scene where a gunman killed 23 people including himself, with semi-automatic gunfire during lunchtime on Wednesday, Oct. 16, 1991. It was the deadliest mass shooting in U.S. history. (AP Photo/Rick McFarland) (AP Photo/ Rick McFarland)

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