THE FBI has released closed-circuit video footage that shows the gunman responsible for the mass-shooting at the Washington Navy Yard on September 16.

The YouTube video shows Aaron Alexis, now deceased, drive a blue Toyota Prius rental car through the Washington Navy Yard main gate.

Carrying a backpack, he then enters Building #197 with a valid pass he gained through his work as a contractor.

The video then shows Alexis carrying a Remington 870 shotgun as he moves through hallways and stairwells in Building #197.

Closed circuit video shows Aaron Alexis drives a rental car through a gate at the Washington Navy Yard.
Closed circuit video shows Aaron Alexis drives a rental car through a gate at the Washington Navy Yard. FBI

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