Mass shootings in U.S. history

Published: Jul 20 2012 10:20:30 AM EDT   Updated On: Aug 24 2012 11:23:52 AM EDT

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

Worried parent outside school
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CTNow via CNN

Sources say close to 30 people were killed, many of whom were children, during a school shooting the Sandy Hook Elementary School in Newton, Conn.

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