Police are asking for help in identifying a man wanted for assaulting an on-duty MTA bus driver.

It happened Friday just after 5:30 p.m. at the corner of 3rd Ave and E 163rd Street.

The 42-year-old MTA employee was operating the BX 15 bus when a man got on and started arguing with him.

The man then punched the driver, according to authorities.

Police say the suspect took off on a bicycle and was last seen wearing a black hoodie with a large Nike Air lettering.

Police ask anyone who may know the suspect to give them a call.