Waianae High School was on lockdown for about 45 minutes after a 19-year-old  student was cut with a knife during a fight with another student just before lunch Friday.

The boy received multiple cuts, including one to the shoulder, and was taken to the Queen’s Medical Center for treatment, said Donalyn Dela Cruz, Department of Education spokeswoman.

The Department of Emergency Services said the victim was transported in serious condition.

The incident began about 12:17 p.m. at an outdoor basketball court while other students were still in class, Dela Cruz said. A school employee broke up the fight, she said. No other students were involved.

The suspect, of a Lahaina Street addres and also 19, was arrested at the scene on suspicion of attempted murder and criminal property damage.

The lunch period was delayed for about 45 minutes because of the lockdown, Dela Cruz said.