Transit Crime Investigation Unit officers are appealing for information following a sexual assault at a bus stop in Cranbourne last month.
Investigators have been told a 22-year-old woman was standing at the bus stop on High Street just before 10 am on 9 April.
An unknown man approached her from behind and inappropriately touched her before walking away.
The man is perceived to be of Middle Eastern appearance, 40-60 years old with short dark-coloured hair and a moustache.
He was wearing a brown jacket, light blue pants and a long shirt.
Investigators have released CCTV and an image of a man they believe may be able to assist with their investigation.
Anyone who witnessed the incident or with information about the identity of the man is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential report at www.crimestoppersvic.com.au