TODAY   |  December 15, 2013

'Act of evil': Details emerge about Colo. school gunman

Officials say alleged shooter Karl Pierson intended to "harm many" in Friday's rampage. NBC's Ron Mott reports.

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>>> there are new details this morning about the 18-year-old who opened fire at his colorado high school on friday critically wounding one student. police now say the gunman likely intended to hurt many more. ron mott is outside arapahoe high school in centennial, colorado, with the latest. good morning.

>> reporter: good morning. police, in fact, say karl pierson showed up here ready to hurt a lot of people on friday and the terrifying scene that unfolded didn't take much time at all, just 80 seconds from start to finish. a community gripped in shock and sadness gathered to pray for 17-year-old senior claire davis, the lone shooting victim from friday's violence at arapahoe high school shot in the head at point-blank range, randomly police suspect by karl pierson. officials say he stormed into the school shortly after 12:30 , making no effort to hide the pump action shotgun he legally bought the week before, looking for the school's debate coach. students say pearson who voiced strong political views had recently been kicked off the team.

>> his intent was evil.

>> reporter: the sheriff who refused to mention pearson by name said the student was also named with a machete, multiple rounds of ammo and three molotov cocktails .

>> he is someone who victimized an innocent young lady by an act of evil. in my opinion he deserves no notoriety and no celebrity.

>> reporter: police say pier son fired five shots. some of the chaos and drama that unfolded were captured on a cell phone from inside a classroom as well as in police dispatches.

>> i have a student down in the athletic hall.

>> reporter: students say they're accustomed to training drills and thought for a brief moment this was just another one.

>> it hits home because it didn't feel real until you see everybody and this really did happen.

>> reporter: we checked in on claire davis, still listed in critical condition this morning.

>> ron mott, thank you.