UPDATE 4-FBI releases video of 'delusional' Navy Yard shooter
* Video shows gunman entering garage, building
* Video shows Alexis carrying shotgun at crouch
* No signs Alexis was targeting anyone - FBI
* Exchanged fire with police for an hour - FBI
By Ian Simpson and Phil Stewart
WASHINGTON, Sept 25 (Reuters) - The FBI released surveillance video and photos of Navy Yard shooter Aaron Alexis on Wednesday and said he believed electromagnetic waves had been controlling him for months before the rampage that killed 12 people.
There are no signs that Alexis, 34, was targeting anybody in the Sept. 16 shooting at the Navy Yard in southeast Washington, said Valerie Parlave, the FBI assistant director in charge of the Washington field office.
"We have found relevant communications on his electronic media, which referenced the delusional belief that he was being controlled or influenced by extremely low frequency electromagnetic waves for the past three months," Parlave told a news conference.
Surveillance video released by the FBI showed Alexis driving a rented blue Toyota Prius into a Navy Yard parking garage shortly before 8 a.m. Carrying a backpack, he then entered the Naval Sea Systems Command building, site of the shootings, through a door. Continued...