Take a look at some of the worst mass shootings in U.S. history.
July 20, 2012: James Holmes is accused of opening fire in an Aurora, Colo., movie theater, killing at least 12 and wounding 58 others.
Wisconsin Dept. of Natural Resources
Enrique Castro-Mendivil / Reuters
Gene Blevins / Reuters
Patrick T. Fallon/Reuters
Larry Downing / Reuters
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