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.