Police called 20 minutes after Navy Yard shooting began

New evidence is emerging in the shooting that killed 12 in the Washington, D.C. Navy Yard. It wasn’t until nearly half an hour after the carnage began, the FBI says, that the first officers to enter the building had the shooter in their sights. And the FBI now says that there is no evidence Aaron Alexis fired from the upper floors of the building down into the atrium below. NBC’s Pete Williams reports.

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