Pa. High School Stabbing Suspect Alex Hribal Not 'Well-Liked': Source

April 9, 2014— -- The 16-year-old student accused of going on a stabbing rampage today at a Pennsylvania high school "wasn't a real well-liked kid" and had previously made death threats, the brother of a witness told ABCNews.com.

Alex Hribal is a sophomore at Franklin Regional High School, where the bloodshed happened today, said police. He's being held at a juvenile detention center in Westmoreland County after being charged with four counts of attempted criminal homicide, 21 counts of aggravated assault and one count of possession of a weapon on school property.

He was denied bail.

Stabbing Spree at Pennsylvania High School Injures 20

“It was pretty common knowledge between all the kids that he had made some death threats,” said the source, who graduated from the school in 2010 and whose sister is a sophomore there.

“I guess the kids who got the threats just assumed it’s no big deal," he said, noting his sister was “about a foot or two” from another student who was stabbed today.

“The kid in front of her started screaming and she saw a bunch of blood,” he said, recounting his sister’s story.

At one point, Hribal tackled another student, said the source, who asked not to be named.

“He jumped on the kid’s back and was stabbing him pretty hard,” said the source, whose sister escaped the school unharmed.

At least 22 people were stabbed, including three who were in critical condition this afternoon, authorities said.

A student who plays hockey with Hribal told ABC News that the teen was quiet but a “pretty normal kid.”

Hribal had a preliminary hearing set for April 30.