BRONX, N.Y. - An unprovoked attack on a city sanitation worker in the Bronx was caught on camera last week and now police are asking for the public's help.

Investigators say the 41-year-old DSNY supervisor was leading a cleaning crew when the man ran up to him and punched him in the face.

Police say it happened January 2 on Grant Highway near 169th Street in Highbridge.

The supervisor refused medical attention.

Anyone with information on the case should contact the Crime Stoppers hotline at 1-800-577-8477, or text CRIMES and then enter TIP577, or visit www.nypdcrimestoppers.com.