The footage includes the following:
- Alexis drives his rental car, a blue Toyota Prius, through the Washington Navy Yard main gate.
- Alexis enters Building #197 carrying a backpack. Alexis had legitimate access to the Washington Navy Yard as a result of his work as a contractor and he utilized a valid pass to gain entry to the building.
- Alexis moves through the hallways and a stairwell of Building #197 carrying a Remington 870 shotgun.
More at: http://www.fbi.gov/washingtonnavyyard