Mass shootings in U.S. history

POSTED: 07:20 AM PDT Jul 20, 2012    UPDATED: 08:23 AM PDT Aug 24, 2012 

Take a look at some of the worst mass shootings in U.S. history.

Colorado Scene - 1
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July 20, 2012: James Holmes is accused of opening fire in an Aurora, Colo., movie theater, killing at least 12 and wounding 58 others.

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