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.

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A man who apparently had just lost his job at a small business in Minneapolis returned to the building Sept. 27 and opened fire, killing the company's founder and three others and wounding four others before taking his own life.

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