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Mass shootings in U.S. history

Published On: Jul 20 2012 07:20:30 AM PDT   Updated On: Aug 24 2012 08:23:52 AM PDT

Take a look at some of the worst mass shootings in U.S. history.

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Fred Prouser/Reuters

Dec. 24, 2008: Bruce Jeffrey Pardo, 45, dressed up in a Santa suit and showed up at a Christmas party at his ex-wife’s parents’ house in Covina, Calif., where he shot nine people to death and then burned the house. He later killed himself.

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