A correctional officer was hospitalized due to an assault by an inmate at Sing Sing correctional facility, according to union officials.

The New York Correctional Officers and PBA says the attack occurred while an officer was closing cells. The inmate allegedly grabbed his gate and attempted to force it open, slamming the officer’s hand and wrist between the gate and cell bars twice.

The officer tried using pepper spray, but the inmate was able to charge and slam him into steel fencing, they say. The officer managed to put the inmate in a body hold on the floor until backup arrived.

The officer was taken to Phelps Hospital for injuries to his left hand, wrist and fingers.

The inmate, who is serving a 25-year sentence for beating and stabbing an 81-year-old to death, is facing disciplinary action.

This comes a day after another Sing Sing officer was sent to the hospital after being repeatedly punched by an inmate.