LINCOLN, Neb. (AP) — The Nebraska Correctional Services Department says two staff members were injured in separate attacks by inmates at the Lincoln Correctional Center.

The first happened just after 1 p.m. Wednesday when an inmate punched a staffer. The staffer and other staff members gained control of the inmate and returned him to his cell. The department says the staffer suffered a chipped tooth and a concussion.

The second incident occurred around 6:30 p.m. Wednesday, when an inmate struck a staffer on the side of her face. She used pepper spray on him as he approached a second time. The department says the staffer suffered a concussion.

The names of those involved haven’t been released.