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Arapahoe: More Damage Planned

Gunman who took his own life after shooting classmate entered school with gun, ammo, machete and Molotov cocktails.
(NBC News)  Police have finished their search for evidence inside the Colorado high school where an 18-year-old senior armed with a shotgun, machete and several Molotov cocktails shot a fellow student Friday before taking his own life.

Investigators say Karl Pierson had likely been planning his attack for a long time, and that things apparently escalated when he was kicked-off the Arapahoe High School debate team after a trip to a national tournament this summer.

Police believe Pierson was trying to hunt down librarian and debate team coach Tracy Murphy when he shot Claire Davis in the head at point-blank range.

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