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At least 20 students in the Pittsburgh-area were injured after an early morning stabbing at Franklin Regional High School.

Four of those students are seriously injured. Dr. Chris Kauffman, the trauma director at Forbes Regional Hospital, characterized some of the teenage victims’ wounds to the chest, back, and abdomen as life-threatening.

According to CBS Local:

A school resource officer called in the stabbing at 7:13 a.m.

Forbes Hospital says 7 victims have been taken to their hospital, 1 victim has been flown to Allegheny General Hospital, and 2 taken to UPMC-Presby.

The male suspect, 16, is in custody and is reportedly a student at the high school. After being taken into custody, the suspect was transported to an area hospital for treatment of injuries to his hands, Murrysville Chief of Police Thomas Seefeld said in a press conference.

According to a witness, the stabbings happened in the science wing of the building.

“One of the children that pulled the alarm, my daughter said, after the incident happened to clear the school. She reported to me it was a 10th grade student,” parent Tim Graham told KDKA.

It is being reported that the principal of the school tackled the suspect, enabling police to take him into custody. All classes in the Franklin Regional school district have been canceled.

Shortly after the incident, a victim of the stabbing spree posted this photograph to his Instagram with the caption, “chillin at children’s.”

As this is an active investigation, we’ll keep you updated with the latest.

This story is developing