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Emergency personnel gather on the University of Oklahoma's
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Emergency personnel gather on the University of Oklahoma's campus in Norman, Oklahoma. Reports of shots fired at the University of Oklahoma's architecture school prompted a brief lockdown, but officials said no evidence of a shooting had been found as authorities continued to sweep the building. (Jan. 22, 2014)(Credit: AP)

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School shootings in the U.S. and around the world

In the wake of shootings at schools this week in Indiana, South Carolina and Oklahoma, a look at some of the most notorious school shootings in the U.S. and around the world.

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