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.

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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