Detectives from Transit Crime Investigation Unit have released an image of a man they want to identify in relation to an indecent act that took place on a bus in Doncaster earlier this month.
Investigators have been a woman boarded the Route 903 bus at a Doncaster shopping mall, about 11am on Wednesday 15 September.
The victim noticed a man move to sit opposite her before rubbing his hand over his groin region whilst staring at her.
The victim exited the bus shortly after and the man remained seated.
Investigators have released an image of a man who they believe can assist with their enquiries.
The man is described as Caucasian in appearance, aged between 40-50-years with short grey hair and a grey beard.
The man was wearing a black zip-up jacket, a green t-shirt, dark blue denim jeans.
He was also wearing a blue disposable mask, black sunglasses and black watch.
Anyone with any information is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential report online at www.crimestoppersvic.com.au.