WASHINGTON, DC - SEPTEMBER 16: In this handout frame grab from the Washington Navy Yard provided by the FBI on September 25, 2013, Aaron Alexis rental car enters Washington Navy Yard Parking Garage #28 at 7:53 a.m. on September 16, 2013 September 16, 2013 in Washington, DC. The FBI investigation indicates that the gunman, Aaron Alexis, acted under the delusion that he was being controlled by extremely low frequency (ELF) electromagnetic waves when he carried out his attack on the Navy Yard, in which 12 people were killed and 4 were wounded. (Photo by FBI via Getty Images)