A 78-year-old man was beaten aboard an MTA bus in Brooklyn and police on Tuesday released photos of the suspect.

The victim was arguing with another rider on a northbound B61 bus when the assailant attacked him near Court St. and W. Ninth St. in Carroll Gardens around 12:35 p.m. on Feb. 21, according to law enforcement officials.

The suspect repeatedly punched the victim in the face before exiting the bus and fleeing on foot, cops said.

Medics took the victim to Methodist Hospital in stable condition.

The suspect was last seen wearing a dark colored jacket, dark colored pants and dark shoes, cops said.

Anyone with information is asked to call Crime Stoppers at (800) 577-TIPS. All calls will be kept confidential.