NBC News   |  December 30, 2013

Sheriff: Arapahoe Gunman Entered School Through Unlocked Door

During a news conference regarding the investigation into the shooting at Arapahoe High School on Dec. 13, Sheriff Grayson Robinson says the door suspected gunman Karl Pierson, who was allegedly armed with a shotgun, more than 125 rounds of ammunition, a machete and Molotov cocktails, entered through is supposed to be locked but rarely is because it's inconvenient.

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