Gibson told KCRA that the fight started when a parent who was frustrated with the school’s mask mandate saw his daughter walk out of the building with a face covering. After the parent got into an argument with the principal, a male teacher intervened, the superintendent said. The situation escalated into a physical fight, leaving the teacher “bleeding,” according to Gibson.

The teacher suffered “lacerations on his face, some bruising on his a face and a pretty good knot on the back of his head,” she told KCRA. He was treated at the hospital and later released Wednesday.

It was unclear if the parent sustained any injuries, but he was banned from being on campus, according to KCRA.