The Washington Navy Yard shooter believed he was being subjected to an "ultra low frequency attack" and left an electronic note saying this was "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 FBI says.
Aaron Alexis, 34, a computer technician for a private Navy contractor, killed 12 people and wounded four others in the September 16 rampage as he fired a sawed-off Remington 870 Express shotgun in which he had etched several statements, including: "End to the torment!"
The FBI also released video and still photographs from Building 197 at the Navy Yard, including scenes of Alexis in a dark blue-and-white shirt and dark trousers, wielding the shotgun as he roamed down hallways and stairwells in search of victims.
Valerie Parlave, assistant director in charge of the FBI's Washington field office, said Alexis did not expect to survive the shootings that spanned nearly an hour that Monday morning.
"There are indicators that Alexis was prepared to die during the attack and that he accepted death as the inevitable consequence of his actions," she said.
She also stressed that there was no evidence that Alexis was purposely hunting down any co-workers or supervisors he might have known during his time working at the Navy Yard since August 25.
"There is no indication to date that Alexis was targeting specific individuals," she said.
DEPARTMENT OF DEFENCE 'FURIOUS'
The US Department of Defence is reportedly "furious" the FBI released video footage of the Navy Yard shooter earlier today, according to Jennifer Griffin, national security correspondent for Fox News.
A senior Pentagon official told Griffin that the release of the video was "unnecessary" and that it will bring pain to the families of the victims by bringing life back to the shooter, Aaron Alexis.
The video released earlier today during a press conference showed Alexis entering and moving through the Navy Yard facility with a gun, but did not depict any actual violence.
- MCT, Business Insider