A Rikers Island correction officer has been charged with beating two inmates in separate incidents.

Timothy Munroe pleaded not guilty to charges of assault and falsifying records.

Bronx District Attorney Robert Johnson says Munroe punched an inmate in the face and broke his nose as punishment for disruptive behavior on Dec. 12, 2008.

In another incident, Munroe is accused of punching another inmate in the face last Jan. 24.