WASHINGTON (September 25, 2013)—Aaron Alexis, 34, the man who opened fire inside a building at the Washington Navy Yard killing 12, held a delusional belief that he was being controlled by extremely low frequency waves, or ELF waves, Valerie Parlave, head of the FBI's field office in Washington, said Wednesday.
She said investigators are continuing to explore Alexis’ background and motivation, but said Alexis had a well-documented history of mental health issues.
Parlave said Alexis had written "my ELF weapon" on a shotgun he used in the rampage.
The FBI says there is no indication that he targeted any specific individuals when he opened fire.
The former Navy reservist and IT contractor, was killed in a shootout with police.