Classmate Says Stabbing Suspect Had 'Disturbing Twist'

Classmates give a different description of the teen accused of stabbing 22 people.
1:56 | 04/10/14

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Transcript for Classmate Says Stabbing Suspect Had 'Disturbing Twist'
ABC's Pierre Thomas is also in murrysville. He has that. Good morning, Pierre. Reporter: Good morning, George. The young man is being held at the correctional facility behind me. On suicide watch. After a day so bloody, no one here can believe it. Alex Hribal in handcuffs. Only 16. Charged as an adult. Accused of a cold-blooded stabbing spree that sent his school into chaos. Witnesses say he was expressionless, no emotion. Calmly attacking in an explosion of violence. When apprehended, he allegedly told police he wanted to die. His stunned father, only offer well-wishes to the wounded. My prayers go out to everyone who was injured today. And hope they recover as quickly as possible. Reporter: A family attorney telling ABC news, that Hribal's parents describe him as a good student, who had never been in trouble, with no history of psychiatric problems. They said he looks young for his age. But that he mingled well with other children. But some of Hribal's classmates disagreed. One of them telling us, he seemed nerdy, but with a dark side. He was like and a little misunderstood. But there was a disturbing twist about him. I thought he had a different side to him that no one knew. Reporter: His calm demeanor during the rampage, like so many troubled young men of mass violence before him. Columbine, paducah, Kentucky, and sandy hook in Newtown, Connecticut. Unlike many episodes of mass violence, this was different. The suspect used not guns, but two knives. Anytime you use a knife in an attack, it's much more personal. You literally have to be on top of somebody. Reporter: Last night, the FBI seized Hribal's computer and searched his home in a hunt for a motive. Police say they're investigating reports he may have placed a threatening phone call to a classmate the night before the rampage. With no clear motive, police are looking into whether the suspect was bullied. They need to know why so much rage.

This transcript has been automatically generated and may not be 100% accurate.

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