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.

Jared Lee Loughner
6 / 25
Pima County Sheriff's Dept.

Jan. 8, 2011: Jared Lee Loughner is accused of killing six and wounding at least 12, including then-Rep. Gabrielle Giffords, outside a grocery store in Tucson, Ariz.

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