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Some of the deadliest mass shootings around world

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A gunman at a Connecticut elementary school killed more than two dozen people, including children, on Friday. It is among the world's worst mass shootings. Here is a look at some others: — July 20, 2012: Twelve people are killed when a gunman enters an Aurora, Colo., movie theater, releases a canister of gas and then opens fire during opening night of the Batman movie "The Dark Knight...