By Molly Born, Pittsburgh Post-Gazette

Twenty students were injured — four seriously — in a multiple-stabbing incident Wednesday morning inside Franklin Regional High School in Murrysville, about 20 miles east of Pittsburgh.

Westmoreland County public safety spokesman Dan Stevens said a suspect, also a student, is in custody and was being questioned by Murrysville police and Westmoreland County detectives.

Those seriously injured were flown to hospitals by medical helicopter. Some of the 20 injured students suffered stab wounds to the extremities, he said.

None of the injuries was life-threatening, he said.

The injured students’ ages range from 14 to 17.

Just before 7:15 a.m., a school resource officer asked for medical assistance at the school for a stabbing. The students were injured in several classrooms and in the hallways before the classes started, Stevens said.

Parents of the injured students were being contacted.

Police, emergency crews and school buses lined the entrance to the school Wednesday morning. A stretcher was loaded into an ambulance around 8:15 a.m.

On its website, the school district said, “A critical incident has occurred at the high school. All elementary schools are canceled, the middle school and high school students are secure. Additional information will be released as soon as possible. Please keep our campus clear of traffic.”

AFP Photo/Ross Mantle