A 16-year old teenage boy running around with two kitchen knives went on a stabbing rampage at his high school in Murrysville, Pennsylvania, early Wednesday, before being tackled by an assistant principal, authorities said.
At least 20 people at Franklin Regional Senior High School, just east of Pittsburgh, were injured - about half of them seriously - and the accused attacker is in custody, Police Chief Thomas Seefeld said.
The horrible event began in the school hallway just before classes started, with the attacker allegedly going from classroom to classroom.
A doctor who treated six of the victims said most of them didn't immediately know what happened. They were still in shock apparently.
"They just felt pain and noticed they were bleeding," Dr. Timothy VanFleet, chief of emergency medicine at the University of Pittsburgh Medical Center, told CNN's Ashleigh Banfield.
"Almost all of them said they didn't see anyone coming at them. It apparently was a crowded hallway and they were going about their business, and then just felt pain and started bleeding."
Student Mia Meixner was standing at her locker and who was an eyewitness:
"I heard a big commotion like behind my back," she told CNN's Wolf Blitzer. "And I turned around and I saw two kids on the ground."
She thought a fight had broken out, but then she saw blood. "I saw the kid who was stabbing people get up and run away," she said.
Meixner said she saw three students help a bleeding freshman, saying they were taking him to a nurse. Then she saw a senior girl she knew.
"She was standing by the cafeteria doors. ... She was gushing blood down her arm."
Meixner dropped her books and went to help the girl.
"I started hearing a stampede of students coming down from the other end of the hall, saying 'Get out, we need to leave, go, there's a kid with a knife.' Then a teacher came over to me and the girl I was trying to help. And she said she would handle the girl and that I should run out. So then I just ran out of the school and tried to get out as soon as possible."
Blitzer asked Meixner whether the stabbing suspect said anything.
"No. He was very quiet. He just was kind of doing it," Meixner answered. "And he had this, like, look on his face that he was just crazy and he was just running around just stabbing whoever was in his way."
She said she didn't know the boy, but he had been in a lot of her classes. "He kept to himself a lot," she said. "He didn't have that many friends that I know of, but I also don't know of him getting bullied that much. I actually never heard of him getting bullied. He just was kind of shy and didn't talk to many people."
Pittsburg Police are expected to give a press release this afternoon with further details.
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