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One male student was in custody Wednesday after at least 20 people, most of them students, were stabbed in classrooms and the hallway of a high school in Murrysville, Pa., near Pittsburgh.

Four of the most seriously injured victims were taken from Franklin Region High by helicopter, KDKA-TV reports. The station said emergency officials indicated that one of the victims was in his 60s, apparently a staff member or teacher.

Dr. Chris Kaufmann, director of the trauma center at Forbes Regional Hospital in Monroeville, told WPXI-TV that at least 7 of the victims have life-threatening injuries.

These are significant injuries, he told CNN.

Doctors say a female students saved the life of a stabbed classmate by applying pressure until medics arrived, WTAE-TVreports.

A witness tells the Pittsburgh Post-Gazette that the male suspect was tackle by assistant principal Sam King.

On its website, the school posted a message to parents that read, A critical incident has occurred at the high school. All elementary schools are cancelled, 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.

Dan Stevens, spokesman for Westmoreland County emergency management, says the suspect was in custody at Franklin Regional High School in the Murrysville, which is located about 15 miles east of Pittsburgh.

The suspect reportedly stabbed students in classrooms and in the hallway around 7 a.m. ET before classes began Wednesday morning.

The Pittsburgh Post-Gazette says the stabbings reportedly occurred after a fire drill. Parents in the district have been told to pick up their children, who were moved from the high school to the middle school.

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