CORALVILLE, Iowa (AP) — The Iowa Corrections Department says an inmate struck a guard at the state’s medical classification center in Coralville. The department says the assault occurred around 6:15 p.m. Tuesday, when the inmate didn’t follow the guard’s instructions. The two clashed and fell to the floor, where the inmate punched the guard several time atop the head. The department says other staffers and another inmate came to the guard’s aid.

The guard was examined at a local hospital and found to have suffered no significant injuries. The names of those involved haven’t been released.