Navy Yard 911 calls: 'Multiple people down'

Credit: MGN Online

Navy Yard 911 calls: 'Multiple people down'

September 18, 2013 Updated Sep 18, 2013 at 10:53 AM CDT

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.