(CNN) — Aaron Alexis, the man who went on the deadly shooting rampage at the Washington Navy Yard, was under the “delusional belief that he was being controlled or influenced by electro-magnetic waves,” the FBI’s Valerie Parlave said Wednesday.
Parlave, assistant director in charge of the FBI Washington Field Office, said Alexis acted alone and there was no evidence he was targeting particular people.
The investigation indicates that Alexis was prepared to die during the incident and accepted that as a consequence of his actions, Parlave said.
Alexis, who was 34, went on the rampage September 23. In addition to the 12 deaths, Alexis wounded several people before he was killed.