A correctional officer at Sing Sing Correctional Facility was seriously injured by an inmate on Tuesday during a return to cells, authorities say.

The inmate allegedly punched the officer, threw him down stairs and continued assaulting.

Additional staff intervened and subdued the inmate.

The officer suffered a broken foot, as well as knee, ankle and facial injuries.

Two responding officers were also injured.

The inmate, serving a two-to-four-year sentence for criminal possession of a weapon, was transferred to Coxsackie Correctional Facility.