The Federal Bureau of Investigations released the video footage of Washington Navy Yard shooter Aaron Alexis and details of their ongoing investigation into the shooting that took place last week, in which 12 people were killed. The video below is courtesy of CBS News and is looped.

The video shows the shooter pulling into the Navy Yard, walking through the doors, and stalking the hallways holding his gun.

In addition to the video the FBI released a statement and 12 photos.

“There are multiple indicators that Alexis held a delusional belief that he was being controlled or influenced by extremely low frequency (ELF) electromagnetic waves,” reads the FBI’s statement.