The FBI on Wednesday released new surveillance footage of the Washington Navy Yard shooter, 34-year-old Aaron Alexis, walking through the halls of the building with a shotgun the day he killed 12 people and injured others last week:

The FBI also released images from the shooting scene and collected evidence :

FBI Releases Chilling New Video of Navy Yard Shooter Stalking Halls With Shotgun

Alexis drives his rental car, a blue Toyota Prius, through the Washington Navy Yard main gate (FBI)FBI Releases Chilling New Video of Navy Yard Shooter Stalking Halls With ShotgunAlexis’ rental car enters Washington Navy Yard Parking Garage #28 at 7:53 a.m. on September 16, 2013 (FBI)

FBI Releases Chilling New Video of Navy Yard Shooter Stalking Halls With Shotgun

Alexis moves through the hallways of Building #197 carrying the Remington 870 shotgun (FBI)

FBI Releases Chilling New Video of Navy Yard Shooter Stalking Halls With Shotgun

Alexis moves through the hallways of Building #197 carrying the Remington 870 shotgun (FBI)

FBI Releases Chilling New Video of Navy Yard Shooter Stalking Halls With Shotgun

Aaron Alexis’ backpack was found in the fourth-floor men’s bathroom, hanging on the back of a stall door (FBI)

FBI Releases Chilling New Video of Navy Yard Shooter Stalking Halls With Shotgun

Aaron Alexis’ rental car, a blue Toyota Prius with New York plates, was located in Washington Navy Yard Parking Garage #28 (FBI)

FBI Releases Chilling New Video of Navy Yard Shooter Stalking Halls With Shotgun

Aaron Alexis’ Remington 870 shotgun with sawed-off barrel and stock. Etchings on the left side of the shotgun receiver read “Better off this way!” and “My ELF weapon!” (FBI)

FBI Releases Chilling New Video of Navy Yard Shooter Stalking Halls With Shotgun

A close-up photograph of the etchings on the left side of Alexis’ shotgun receiver (FBI)

FBI Releases Chilling New Video of Navy Yard Shooter Stalking Halls With Shotgun

Aaron Alexis’ Remington 870 shotgun with sawed-off barrel and stock. Etching on the right side of the shotgun receiver read “Not what yall say!” (FBI)

FBI Releases Chilling New Video of Navy Yard Shooter Stalking Halls With Shotgun

A close-up photograph of the etching on the right side of Alexis’ shotgun receiver (FBI)

FBI Releases Chilling New Video of Navy Yard Shooter Stalking Halls With Shotgun

Etching on the barrel of the Remington 870 shotgun used by Alexis read “End to the torment!” (FBI)

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Featured image FBI.