(NEWSER) – All 20 people wounded in today's knife attack at a school in suburban Pittsburgh are expected to survive, including a male student on a ventilator who was stabbed in the liver, reports AP. Police have identified the suspect as 16-year-old sophomore Alex Hribal, reports the Pittsburgh Post-Gazette, though they have said nothing about a motive. Authorities say a security guard alerted by students at Franklin Regional High School in Murrysville confronted the student in a hallway and brought him to the ground, and assistant principal Sam King jumped in to subdue him. (The unidentified security guard got stabbed in the abdomen during the melee.) Some other details emerging:

  • Police say the attack began in a classroom when Hribal pulled out two large butcher knives and began slashing students. He followed them as they fled and stabbed others in the hallway.
  • During the assault, the attacker "was very quiet," student Mia Meixner tells CNN. "He just was kind of doing it. 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."

Read the full story on Newser.com