A boy was flown to a hospital Tuesday afternoon after being stabbed at a South Florida high school, according to a representative of Miami-Dade County Public Schools.

The incident happened just before 1 p.m. at Barbara Goleman Senior High School at 14100 NW 89th Ave. in Miami Lakes.

Miami-Dade County school police said there has been an ongoing confrontation between two boys, a junior and a senior, since the beginning of the school year. One of the boys ambushed the other in a stairwell in the school during lunch, stabbing him with a utility knife, police said.

"This afternoon during the lunch hour at the high school, we had an altercation between two students. That altercation unfortunately resulted in one of the students producing a small folding Swiss utility knife and subsequently harming another student," said Miami-Dade Schools Police Chief Charles Hurley. "The one student sustained some lacerations to his torso, on his side, by the rib cage toward the back and the abdominal area."

The 17-year-old 11th-grader was flown to Jackson Memorial Hospital's Ryder Trauma Center with non-life-threatening injuries.

The school was immediately put on lockdown after the stabbing, and no one was allowed in or out.

The police chief would not discuss what led up to the fight, saying only that boy boys had "culpability."

The other boy involved in the incident is in police custody, but no charges have been filed yet.