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.

Clackamas Town Center mall shooting
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A man opened fire at the Clackamas Town Center mall in Oregon Tuesday, leaving three dead, including the shooter, according to a spokesman from the Clackamas County Sheriff's Office. Take a look at some of the worst mass shootings in U.S. history.

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