"We heard a big noise and stuff in the hallway. But we didn't know what happened until everybody came and said somebody got stabbed," said Kenneth Moore, DuSable student.
The 16-year-old victim was taken in critical condition to Stroger Hospital, where, according to officials, he is improving.
The 15-year-old offender, also a student, is in custody. His father told ABC7 his son acted out of self defense against a bully.
"He just defended himself, OK? This has been going on since October. OK? I'm telling you right now, it seems like they turned a deaf ear," said Derome, father of accused attacker. "I don't know if they document anything or what. Ok? I was up here every time something was going on."
The 15-year-old's father told ABC7 he and his son had just met with a counselor about the problems with this bully when his son went to get his homework. The 16-year-old allegedly confronted the 15-year-old at his locker, so Derome's son ran back into the counselor's office, where he grabbed scissors. He then allegedly stabbed the 16-year-old.
The Chicago Police Department is not commenting on the case. The school remains on lockdown.