Navy Yard 911 Calls: 'Multiple People Down'

September 27, 2013 Updated Sep 18, 2013 at 11:52 AM EDT

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Credit: MGN Online

Navy Yard 911 Calls: 'Multiple People Down'

September 27, 2013 Updated Sep 18, 2013 at 11:52 AM EDT

The FBI says Navy Yard gunman Aaron Alexis had a shotgun when he entered a building and got a handgun inside after he started firing. 911 calls that were released Tuesday show the moments of terror that followed.