CHICAGO (CBS) — A 21-year-old cheerleading coach was stabbed in the chest on Wednesday during a fight between a group of students at a West Side high school.

The woman was trying to break up a fight outside Al Raby High School, at 3545 W. Fulton Blvd., at around 3:30 p.m. Wednesday, police said.

When the coach intervened, a 16-year-old girl stabbed her in the chest.

The coach was taken to Mount Sinai Hospital, where she was in serious condition on Thursday.

The girl was charged as a juvenile with one count of battery.

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