Who is 16-year-old Alex Hribal?

Hribal was the student who went on a rampage at his high school stabbing as many as twenty one  victims, in  Pennsylvania.

Hribal was charged as an adult and faces four counts of attempted homicide and 21 counts of aggravated assault related to the 21 people he wounded.

Some classmates describe him as having few friends and being quiet, but also as a "really nice kid."

High-schooler,, Mia Meixner was tending to her locker at the start of her day when a ruckus behind her got her attention.

Two boys were scuffling on the floor. Nothing to worry about, she thought -- until she saw one of them lift his shirt and blood gushed from his stomach.

He had been stabbed, Meixner said. The other boy ran past her.

In the next five minutes, police say, the boy went from classroom to classroom at Franklin Regional Senior High School, swinging knives. He wounded 20 students and a security officer before the assistant principal tackled him.

Meixner never heard the attacker utter a word.

"He was very quiet. He just was kind of doing it," she said. "And he had this, like, look on his face that he was just crazy and he was just running around, just stabbing whoever was in his way."

He was kind of withdrawn, didn't have many friends and "kept to himself," she said.

"He's actually been a really nice kid," Meixner said in disbelief.

Hribal couldn't seem more normal, the way his lawyer describes him.

"I heard these rumors about being bullied. I don't believe that's true," Thomassey said. "I'm sure that at a certain point, we'll find out what caused this. Maybe there is something that was going on at school that I'm not aware of yet or his parents aren't aware of yet."

He also did not seem to embody the cliche of digitally connected youth.

According to Dan Stevens, the county deputy emergency management coordinator, Hribal had a very minor Facebook presence and didn't have much experience on Twitter.

Thomassey said he would file a motion to move the case to juvenile court. And he wants a psychiatrist to evaluate him.

"I'm not sure he knows what he did, quite frankly," Thomassey said, adding that Hribal feels remorse. "He's scared. He's a young kid," the attorney said.

Westmoreland County District Attorney John Peck argued against bail, saying that there could be no conditions that would protect the community and that Hribal made "statements when subdued by officials that he wanted to die."

Hribal is being held without bail at the Westmoreland County juvenile detention center. He was treated for injuries to his hands, police said.