VIDEO: Pennsylvania School Stabbing Motive Still Unknown

Witnesses say the attacker did not say anything as he ran through a Pennsylvania high school Wednesday, slashing fellow students with two knives, reports CBS News.

The attack at Franklin Regional High School in Murrysville, Pa., left 21 students and a security guard injured. At least three attack victims remain hospitalized.

The school is closed Thursday as officials investigate what motivated the attack.

Shackled and dressed in a hospital gown, Alex Hribal, 16, was charged as an adult Wednesday with four counts of attempted homicide and 21 counts of aggravated assault.

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