The FBI has released footage from closed-circuit video cameras showing Aaron Alexis at the Navy Yard in Washington DC on September 16. The footage includes shots of Alexis driving a rental car through the Washington Navy Yard main gate; the shooter entering Building 197 carrying a backpack; and him moving through the hallways and a stairwell of the building carrying a shotgun. Credit: YouTube/FBI
Video: FBI releases video of Navy Yard shooter
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