A blank look, followed by bloodshed at high school, details the Pa. stabbings
"He had his shirt pulled up and he was screaming, 'Help! Help!'" said another witness, Michael Float, 18. "He had a stab wound right at the top right of his stomach, blood pouring down."
As students rushed to the boy's aid, the attacker slashed Moore before taking off around a bend.
"It was really fast. It felt like he hit me with a wet rag because I felt the blood splash on my face. It spurted up on my forehead," said Moore, whose gashed right cheek required 11 stitches.
The boy ran down about 200 feet of hallway, slashing and stabbing other students with kitchen knives about 8 to 10 inches long, police said. The assault touched off a "stampede of kids" yelling, "Run! Get out of here! Someone has a knife!" according to Meixner.
Assistant Principal Sam King heard the commotion and found a chaotic scene in the blood-soaked hall.
"I've been stabbed," he heard a student say, according to a police affidavit.
King then saw Hribal stab a security guard, who leaned against the wall, bleeding from his stomach, the affidavit said. King tackled Hribal and kept him on the floor until a school police officer handcuffed him.
The rampage lasted about five minutes.
"There are a number of heroes in this day. Many of them are students," Gov. Tom Corbett said in a visit to the town. "Students who stayed with their friends and didn't leave their friends."
He also commended cafeteria workers, teachers and teacher's aides who put themselves at risk to help others.
Looking for a motive, Murrysville Police Chief Thomas Seefeld said investigators were checking reports of a threatening phone call between Hribal and another student the night before. He didn't say whether the suspect received or made the call.
The FBI went to the boy's house, and local media reports said agents removed at least one computer along with other items.
Meixner and Moore called the attacker a shy and quiet boy who largely kept to himself, but they said he was not an outcast and they saw no indication before the attack that he might be violent.
"He was never mean to anyone, and I never saw people be mean to him," Meixner said. "I never saw him with a particular group of friends."
During the attack, the boy had a "blank look," she said. "He was just kind of looking like he always does, not smiling, not scowling or frowning."
Associated Press writers Michael Rubinkam in northeastern Pennsylvania, Joe Mandak in Pittsburgh and JoAnn Loviglio in Philadelphia contributed to this report.
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