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Murrysville, Pennsylvania (CNN) - A teenage boy wielding two kitchen knives went on a stabbing rampage at his high school in Murrysville, Pennsylvania, early Wednesday, before being tackled by an assistant principal, authorities said.
Twenty students and a security officer at Franklin Regional Senior High School were either stabbed or slashed in the attack, Westmoreland County District Attorney John Peck told reporters.
The accused attacker was been identified as 16-year-old Alex Hribal, according to a criminal complaint made public. Hribal, who was arraigned as an adult, faces four counts of attempted homicide, 21 counts of aggravated assault and one count of possession of a weapon on school grounds, the documents show.