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.
Sept. 16, 2013: Authorities say military contractor Aaron Alexis gunned down 12 people and wounded eight others at the Washington Navy Yard before he was killed.
German Federal Archive/Wikimedia Commons
Christian Hartmann, Mario Anzuoni/Reuters
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