(CNN) — A male sophomore went on a stabbing spree at his Pittsburgh-area high school early Wednesday, an emergency management agency spokesman said.
At least 20 students at Franklin Regional Senior High School were injured, and the alleged attacker is in custody, said Dan Stevens, a spokesman for Westmoreland County Emergency Management.
The violence, Stevens said, happened in classrooms and a hallway. Four people were flown to hospitals by helicopter, he said.
Seven teens and one adult were being treated at nearby Forbes Regional Hospital in Monroeville, Pennsylvania, according to Dr. Chris Kaufmann. Their injuries are “quite serious,” and “some are clearly life threatening,” he said.
Victims 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. A third was being prepared for surgery Wednesday morning, and the rest were being evaluated to see whether surgery was necessary, he said.