Mass shootings in U.S. history

Published On: Jul 20 2012 09:20:30 AM CDT   Updated On: Mar 10 2014 02:13:18 PM CDT

A gunman opened fire at the Fort Hood military post in Texas on Wednesday, killing three people and wounding 16 before committing suicide. Take a look at some of the worst mass shootings in U.S. history.

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Sept. 2, 2008: Isaac Zamora, 28, was accused of killed six people in Alger, Wash., and wounding two others before turning himself into authorities. His mother described him to The Seattle Times as “extremely mentally ill,” and authorities said he had been released from jail the month before.

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