LINCOLN, Neb. (AP) — Authorities say a caseworker is recovering after being attacked by an inmate at the Lincoln Correctional Center.

A news release from the Nebraska Department of Correctional Services says an inmate punched the caseworker Friday afternoon in the head and upper body with closed fists. Staff at the prison used pepper spray to subdue the inmate.

The caseworker was taken to a medical facility for treatment. Prisons officials declined to name either the inmate or the caseworker.

Officials say the prisons department will investigate and forward the results of the investigation to the Lancaster County Attorney’s Office, which will determine whether to file any criminal charges.

At least six prison employees have been assaulted by inmates this month, including three staffers at the Nebraska State Penitentiary in Lincoln on Tuesday.