The incident was reported Jan. 10 on a B44 Select bus traveling southbound on Nostrand Avenue at Church Street around 4 p.m.
Authorities released a photo of the suspect Saturday morning that they say rubbed his groin against a 13-year-old girl and a 45-year-old woman.
The suspect exited the bus and ran away after the reported incident.
He was last seen wearing a tan jacket, a black hat, headphones and was carrying two bags.
Anyone with information is asked to call Crime Stoppers at 1-800-577-TIPS (8477).
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