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FBI: Navy Yard gunman left note about radio waves (VIDEO)

Aaron Alexis moves through the hallways of Building 197 at the Washington Navy Yard on Sept. 16, in Washington, carrying a Remington 870 shotgun. Alexis, a 34-year-old former Navy reservist and IT contractor, shot and killed 12 people inside a Navy Yard building last week before being killed in a shootout with police.

Aaron Alexis moves through the hallways of Building 197 at the Washington Navy Yard on Sept. 16, in Washington, carrying a Remington 870 shotgun. Alexis, a 34-year-old former Navy reservist and IT contractor, shot and killed 12 people inside a Navy Yard building last week before being killed in a shootout with police. Photo by The Associated Press.

WASHINGTON (AP) — Washington Navy Yard gunman Aaron Alexis left a note saying he was driven to kill by months of bombardment with extremely low-frequency radio waves, the FBI said Wednesday in a disclosure that explains the phrase he etched on his shotgun: “My ELF Weapon!”

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Surveillance Footage of Navy Yard Shooter

Alexis did not target particular individuals during the Sept. 16 attack in which he killed 12 people, and there is no indication the shooting stemmed from any workplace dispute, said Valerie Parlave, head of the FBI’s Washington field office.

Instead, authorities said, his behavior in the weeks before the shooting and records later recovered from the hotel room where he was staying reveal a man increasingly in the throes of paranoia and delusions.

“Ultra-low frequency attack is what I’ve been subject to for the last 3 months, and to be perfectly honest that is what has driven me to this,” read an electronic document agents recovered after the shooting.

The attack came one month after Alexis had complained to police in Rhode Island that people were talking to him through the walls and ceilings of his hotel room and sending microwave vibrations into his body to deprive him of sleep.

He scrawled “My ELF Weapon!” — an apparent reference to extremely low-frequency waves — on the shotgun, along with “End to the Torment!” “Not what yall say” and “Better off this way.”

Alexis, a 34-year-old former Navy reservist and computer technician for a defense contractor, used a valid badge to get into the Navy Yard with a sawed-off Remington shotgun he had legally purchased two days earlier.

He was killed by a U.S. Park Police officer on the building’s third floor following a rampage the FBI said lasted about an hour.

The FBI said it believes he was prepared to die when he went on the murderous attack.

Surveillance video released by the FBI on Wednesday shows Alexis pulling his rental car into a garage, walking into the building with a bag and then pacing deliberately down a corridor with a shotgun, ducking and crouching around a corner and walking briskly down a flight of stairs.

Alexis had started his job as a contractor in the building just a week before.

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