VIDEO: Footage of School Stabbing Suspect

It is now being reported that a knife-wielding student slashed at 20 people, mostly students, this morning at Pennsylvania's Franklin Regional High School.

Update:

The suspect reportedly slashed randomly at people with a knife, leaving 19 students and a school resource officer wounded.

According to WTAE-TV, the attacker was tackled by an assistant principal and the 60-year-old school resource officer, who is also a Murrysville police officer. One student pulled the fire alarm, which helped to evacuate the school and alert people that an incident was occurring.

According to NBC10.com, the school's principal was able to restrain the suspect, a 16-year-old sophomore, until police arrived, Murrysville Police Chief Thomas Seefeld said during a press conference.

The victims included 19 students and a school security guard, said Seefeld.

Patients were sent to Forbes Regional Hospital, Allegheny General Hospital and University of Pittsburgh Medical Center Presbyterian. Seven of those patients are suffering from life-threatening injuries, although they are expected to survive their injuries.  

The school is in Murrysville, Westmoreland County.

The suspect, also believed to be a student, is in custody. Initial reports were that three medical helicopters were called to the scene, the Pittsburgh Post-Gazette reports.

The stabbings reportedly occurred after 7 a.m. Parents in the district have been told to pick up their children, who were moved from the high school to the middle school.