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The FBI released some pretty chilling footage today of Navy Yard shooter Aaron Alexis running through the halls of the Navy building with his gun pointed.

The FBI also announced the latest findings in its investigation into the shooting, filling in many of the details have already been reported. Alexis shot his first victim at 8:16 a.m. that Monday morning, and after killing 12 people, was shot and killed by police at 9:25 a.m.

Photo and video courtesy of FBI.