Chester, Ill. – Charges are expected to be filed against two inmates accused of assaulting a guard last week at the Menard Correctional Center.

Department Of Corrections spokesman Tom Shaer says the assault included a guard and four other workers last week. They were all treated for their injuries and released the same day. The prison remains on lockdown as of Friday morning.

Shaer says a third inmate involved in the assault was actually trying to stop the other two inmates.