FBI Releases Footage Showing Washington Navy Yard Shooter Roaming Halls with Shotgun

Video footage from closed-circuit surveillance video cameras shows Washington Navy Yard shooter Aaron Alexis on September 16, 2013. The footage includes Alexis driving his rental car, a blue Toyota Prius, through the Washington Navy Yard main gate. The video also shows Alexis moving through the hallways and a stairwell of Building #197 carrying a Remington 870 shotgun. Alexis had legitimate access to the Washington Navy Yard as a result of his work as a contractor and he used a valid pass to gain entry to the building. He was killed after exchanging gunfire with authorities.