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This is -- Fox News alert as we first showed you last hour the FBI -- just releasing brand new video of last week's deadly shooting Rampage in the Washington navy yard.
The FBI surveillance video showing the gunman as he carries out the attack saying the evidence now shows that air and Alexis acted alone.
National security correspondent Jennifer Griffin is live at the Pentagon with more hello Jennifer.
Hi Shannon well there where -- details presented by the FBI in what will be its final press conference on the navy yard shooting.
They released this 32 video the surveillance video from the day of the attack it shows Aaron Alexis.
Bringing his car into the garage.
His his Prius that he had rented he drove into the garage at 7:53.
AM it shows him going into building 197 it shows and moving down the hallway with.
The sawed off shotgun he bought.
A sought at a home improvement store in Northern Virginia on the same day.
-- bought the shotgun on the Saturday before the attack he was able to elude police for an hour inside the building.
The FBI has concluded that the victims he shot were random they weren't people that he necessarily worked with our new.
What is new is what may have motivated -- Alexis.
At this point I can confirm that there are multiple indicators.
That Alexis how the delusional belief.
That he was being control there are influenced.
By extremely low frequency.
The action have quote my -- walk and close quote on the left side of the receiver and -- -- 878 shotgun.
-- believed to reference.
He LF stands for extremely low frequency he thought he was being controlled for the last three months by these magnetic -- He -- the letters and into his shotgun as.
The FBI spokesman said.
He also etched into the barrel into the torment and quote not what you all say.
Better off this way my -- weapon.
DL off technology was elected MF program for -- -- taught all submarine communications.
However -- conspiracy theories exist.
Which misinterpret its application.
As a weapon as a nation of a remote girl frequencies.
For government monitoring.
Of unsuspecting citizens.
So it's very clear that Aaron Alexis was suffering from some sort of mental illness he was delusional and he believed that the navy or government.
What had somehow implanted these electronic.
Pulses magnetic waves into his brain.
And he he -- that into the shotgun that he went around and used to kill twelve people and in -- injured four others.
A week ago at the navy yard.
You know -- -- clearly troubled Jennifer Griffin from pentagon thank you.
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