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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.

Columbine High School
18 / 25
Reuters Photographer / Reuters

April 20, 1999: Eric Harris, 18, and Dylan Klebold, 17, killed 12 classmates and a teacher and wounded 26 at Columbine High School in Littleton, Colo. They then killed themselves.

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