TODAY   |  December 16, 2013

Friend: Colo. shooting suspect read bomb guide

A friend of Arapahoe High School shooting suspect Karl Pierson, who is accused of an 80-second attack that injured one student and ended his own life, said the suspect was a vocal fan of “The Anarchist Cookbook.”

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This content comes from Closed Captioning that was broadcast along with this program.

>> sadly it happened again and this time a 17-year-old girl is in a coma fighting for her life this morning after being shot by one of her classmates at a colorado high school on friday and we're now learning more about the 18-year-old shooter. one of his good friends is speaking out about possible warning signs . ron moth is outside arapahoe high school . good morning.

>> reporter: good morning. classes are cancelled and officials are saying they might allow kids in toward the end of the week to get their stuff before the break. we're starting to get a darker picture of the shooter karl pierson . they talked about him coming back to the debate team but by that time he had already bought a shotgun. could he have been plotting a violent attack for weeks, months, years? one of his friends who helped him deal with frustration after being kicked off of the debate team says looking back is signs that pierson was in more pain than imagined.

>> the karl i knew was a good person but the one that came into school friday was not.

>> reporter: his fellow co-captain on the team had grown darker since pierson competed at a national competition this summer. an event he competed with their coach. but the trip didn't go well.

>> karl and murphy didn't get along. it escalated to a death threat.

>> reporter: pierson had strong opinions on a lot of things, politics, guns and in retrospect pi he may have overlooked signs from the tragedy in which pierson died from a self-inflict self-inflicted gunshot wound.

>> he had been reading the anarchist cook book and giving it to people.

>> reporter: he was armed with a machete and multiple rounds of ammo for his shotgun he bought the week before. while looking for his coach, he encountered 17-year-old clare davis shooting her in the head point blank, authorities say. over the weekend, students gathered to pray for davis returning to campus sunday for another vigil and reflection.

>> it's going to break down all barriers with cliques and friend groups and everybody will love everybody .

>> reporter: clare davis is in critical but stable condition . her family issued a statement saying she is in a coma. they wanted to thank the community for all the outpouring of love and support they have gotten.

>> thank you. we're thinking about her as well. ron moth,