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.

Police car, lights, generic
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iStock / Terraxplorer

July 12, 1976: California State University custodian Edward Charles Allaway killed seven co-workers and wounded two.

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