Transit Crime Investigation Unit detectives are investigating after an unknown male performed a lewd act on board a bus in Melbourne's south-eastern suburbs last month.
It is understood the male directed sexual activity towards a teenage girl on the 785 bus between Mornington and Frankston about 10.20pm on Thursday 27 August.
The 17-year-old victim was not physically injured.
The male is described as Caucasian, 20-25 years old, approximately 162-168cm tall and has blonde hair with a middle part.
He was wearing black jeans, a black shirt and black Kathmandu puffer jacket with green lining.
Investigators have released images of a male they believe may be able to assist with their investigation.
Anyone with information is urged to contact Crime Stoppers on 1800 333 000 or visit www.crimestoppersvic.com.au.
John McLaughlan
