PITTSBURGH, PA (NBC) - The morning calm at Franklin Regional High School outside Pittsburgh erupted into violence around 7:15 this morning just as students were arriving for class.
A student wielding two large knives, went on a rampage stabbing several students.
Before it was over 19 students and one adult were injured, many critically with what doctors describe as deep penetrating wounds.
Panicked parents rushed to the scene searching for news of their children.
The attack, which happened over the course of some 20 minutes, spread across several rooms and hallways. A quick thinking student is being praised for pulling a fire alarm to warn others.
The suspect was eventually confronted and restrained by the principal.
The suspect is a 16-year-old 10th grader who is now in custody as investigators try to determine a motive.