The FBI today released more information related to the Navy Yard shooting, including chilling video footage of the now deceased shooter, Aaron Alexis, carrying a shotgun as he moved through the hallways and a stairwell of Building #197 at the Washington Navy Yard.

In a release from its Washington field office, the FBI confirmed that Alexis was employed as a contractor for a private information technology firm and was assigned to a project at the Washington Navy Yard.  He began working there on September 9th.

Alexis arrived in the DC area on August 25th and stayed at various hotels in the surrounding area between then and the day of the shooting on September 16th.  The release indicates that “Alexis had legitimate access to the Navy Yard as a result of his work as a contractor and he utilized a valid pass to gain entry to Building #197.”

The statement of findings also provides a detailed timeline of Alexis’ activities during the morning of September 16.

Among the details released in today’s findings is an alleged delusion that Alexis believed he was being controlled by extremely low frequency (ELF) electromagnetic waves and the relation of that detail to an etching found on the shotgun Alexis used during the course of the shooting.  From the FBI release:

Analysis of the electronic media recovered from Alexis’ belongings revealed several relevant communications. While analysis of these communications is ongoing in conjunction with other information and evidence determined through investigation, preliminary analysis has yielded clues to his intentions and issues of importance to him. There are indicators that Alexis was prepared to die during the attack and that he accepted death as the inevitable consequence of his actions. There is no indication to date that Alexis was targeting specific individuals.

There are multiple indicators that Alexis held a delusional belief that he was being controlled or influenced by extremely low frequency (ELF) electromagnetic waves. The etching of “My ELF weapon!” on the left side of the receiver of the Remington 870 shotgun is believed to reference these electromagnetic waves. In addition, a document retrieved from his electronic media stated, “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.”

ELF technology was a legitimate program for naval sub-tonal submarine communications; however, conspiracy theories exist which misinterpret its application as the weaponization of remote neural frequencies for government monitoring and manipulation of unsuspecting citizens.

Additional etchings found on the weapon read, “End to the torment,” “Not what yall say” and “Better off this way.”  Authorities say Alexis also obtained a Beretta handgun during the course of the shootings.

The FBI said its investigation to date indicates that Alexis acted alone in the shootings, which killed twelve and wounded several others.  Photos taken at the scene and from surveillance footage can be viewed at the FBI’s web page for the Navy Yard Shootings.