A 16-year-old boy with a 'blank expression' stabbed and slashed 21 students and a security guard in the crowded halls of his suburban Pittsburgh high school Wednesday before an assistant principal tackled him.
The suspect, Alex Hribal, was taken into custody and treated for a minor hand wound, then was brought into court in shackles and a hospital gown and charged with four counts of attempted homicide and 21 counts of aggravated assault.
He was jailed without bail, and authorities said he would be prosecuted as an adult as they searched his parents home. Hribal faces four counts of attempted homicide and 21 counts of aggravated assault and was ordered to face a preliminary hearing in seven to 10 days.
At least five students were critically wounded, including a boy whose liver was pierced by a knife thrust that narrowly missed his heart and aorta, doctors said. Others also suffered deep abdominal puncture wounds.
The rampage - which came after decades in which U.S. schools geared much of their emergency planning toward mass shootings, not stabbings - set off a screaming stampede, left blood on the floor and walls, and brought teachers rushing to help the victims.
Police have so far shed little light on the motive, but said they were investigating reports of a threatening phone call between the suspect and a student the night prior.