WASHINGTON, D.C. (BNO NEWS) -- Aaron Alexis, the civilian contractor and former Naval reservist who killed twelve people when he opened fire at the Navy Yard in Washington, D.C. last week, left a note blaming months of electronic brain attacks for his actions, according to the results of an initial investigation.

Law enforcement officials said an electronic document left behind by Alexis showed he held a "delusional belief" that he was being controlled or influenced by extremely low frequency (ELF) electromagnetic waves. "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," the document said in part.

There were also other indicators to support this belief, according to the results of the initial investigation, which investigators and analysts said gave them a greater understanding of the events that led up to the September 16 massacre. Other indicators include the etching of "My ELF weapon!" and "End to the torment!" on the side of the receiver of Alexis' Remington 870 shotgun that was recovered at the scene.

ELF technology was a program for naval sub-tonal submarine communications, but some conspiracy theories exist which claim the U.S. government has weaponized these remote neural frequencies. This would allow the government to monitor and manipulate unsuspecting citizens, they claim.

The Federal Bureau of Investigation (FBI) on Wednesday also released a chilling 30-second surveillance video which shows Alexis arriving at the Navy Yard in a rented Toyota Prius and then calmly walking into Building 197 with a green and black rucksack slung over his shoulder. He can later be seen creeping down hallways after assembling his shotgun in a fourth-floor men's toilet.

The September 16 massacre at the Navy Yard resulted in the deaths of thirteen people - including Alexis - and injured eight others, making it the deadliest incident in Washington, D.C. since a 1982 plane crash. The incident briefly put the U.S. Senate and other buildings on lockdown as authorities were investigating whether more gunmen were involved.

Days after the shooting, Cathleen Alexis apologized to the victims and said she did not know why her son carried out the shooting rampage. "I don't know why he did what he did and I'll never be able to ask him why," she said. "Aaron is now in a place where he can no longer do harm to anyone, and for that I am glad."

But in the immediate aftermath of the shooting, police reports emerged which suggested Alexis was hearing voices and said there were people sending vibrations through the ceiling to prevent him from sleeping. Police in Rhode Island were called to his hotel room in early August when he reported being followed and feared for his safety.

Alexis also suffered from insomnia in the weeks leading up to the shooting, but told doctors he was not struggling with anxiety or depression. The Department of Veterans Affairs (VA) said Alexis visited the emergency room at the VA Medical Center in Providence, Rhode Island, on August 23 and complained of insomnia, and was given a small amount of medication to help him sleep.

Several days later, Alexis went to the emergency room at the VA Medical Center in Washington, D.C. to request a medication refill and attributed his insomnia to his work schedule. Doctors described him as "alert and oriented" and Alexis denied struggling with anxiety or depression and said he had no thoughts about harming himself or others.

(Copyright 2013 by BNO News B.V. All rights reserved. Info: [email protected].)

Alex Jones will be bouncing up and down today telling us he knew this all along.

What ?!? the man claims his govt is using technology against him for secret experiments? Pwahhh.. Nut case