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(CNN) - A teenage boy went on a stabbing rampage at his high school in Murrysville, Pa., early Wednesday, the town's police chief said.
At least 20 people at Franklin Regional Senior High School, about 15 miles east of downtown Pittsburgh, were injured, and the alleged attacker is in custody, Thomas Seefeld said.
A doctor who treated six of the victims said most of them didn't immediately realize what happened.
"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.
The violence happened in classrooms and a hallway, said Dan Stevens, a spokesman for Westmoreland County Emergency Management.
Student Mia Meixner was standing at her locker.
"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 if 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."
Injuries are serious
Details are emerging about how the teen was stopped. A school principal had "an interaction" with the suspect, and a school resource officer was able to handcuff him, Seefeld said. The teen was being treated for injuries to his hands, the chief said.
Mark Drear, vice president of the security company for the school, said one of his officers was stabbed. The school had three security officers and a full-time police officer Wednesday morning, he said.
A fire alarm that was pulled during the attack probably helped get more people out of the school during an evacuation order. Seefeld said that students were running everywhere, and there was "chaos and panic."
At one point, a female student applied pressure to the wounds of one of the male victims, possibly helping to save his life, said Dr. Mark Rubino, chief medical officer at Forbes Regional Hospital in nearby Monroeville, Pa., where seven teenagers and one adult were taken.
That male teen helped by a fellow student was one of three teens taken into surgery at Forbes.
The adult being treated there was not stabbed; he's suffering from an unspecified medical condition, according to hospital officials.
The teens' injuries are "quite serious," and "some are clearly life-threatening," said Dr. Chris Kaufmann of Forbes Regional.
They were stabbed in their torso, abdomen, chest and back areas, and two people were sent to surgery immediately after arriving, he said. Those two patients had low blood pressure, he said.
The teens who are undergoing surgery suffered knife wounds, most to the lower abdomen, Rubino said.
Physicians are evaluating other patients to see if they need surgery as well, Kaufmann said.
Rubino said he expects all the teens to live, noting that the strength of their youth gives them a greater chance of survival. But "I do want to stress the critical nature of their injuries," he cautioned.
Eleven victims were taken to four University of Pittsburgh Medical Center hospitals, UPMC spokesman Cindy McGrath said. One was sent to UPMC Presbyterian; four were taken to Children's Hospital; one was taken to UPMC Mercy; and five were taken to UPMC East. She did not have ages or conditions of the victims.
Six victims have been released from UPMC hospitals, VanFleet said, and two are in intensive care.
The students who were hurt range in age from 14 to 17, Stevens said. All of the injuries are stabbing-related, such as lacerations or punctures, and there were no guns involved, he said.
School closed 'over next several days'
A message on the Franklin Regional School District's website said all of its elementary schools were closed after the incident, and "the middle school and high school students are secure."
Franklin Regional Senior High will be closed "over the next several days," district school Superintendent Gennaro Piraino said. The district's middle school and elementary schools will be open Thursday, and counseling will be available for the whole district, he said.
Information on what led to the stabbings and the conditions of the injured are still unfolding.
Wednesday, April 9 2014, 02:21 PM CDT
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