Parts of Los Angeles International Airport are shut down after a gunman opens fire. Take a look at some of the worst mass shootings in U.S. history.
Jan. 8, 2011: Jared Lee Loughner is accused of killing six and wounding at least 12, including then-Rep. Gabrielle Giffords, outside a grocery store in Tucson, Ariz.
Ralf Manteufel/Wikimedia Commons
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