Police Transport Unit are investigating an incident that occurred at the Joondalup train station on Friday 20 December 2019.
Around 8:55am, a man was travelling on a bus travelling toward the train station, when he was seen committing an indecent act.
When the bus arrived at the station, the man was spoken to by staff and was asked to wait at the station, however the man left the area.
Police have released a CCTV image of a man who they believe may be able to assist them with their investigation.
The man is described as fair skinned, slim build, 175-180cm tall with facial hair. He also had a tattoo on his upper right arm. He was last seen wearing a cap, grey track pants, a short sleeved shirt and a backpack.
If you have any information about the identity of this person or details of this offence please contact Crime Stoppers on 1800 333 000 or report online at www.crimestopperswa.com.au. You can remain anonymous if you wish and rewards are available once charges are laid. Please quote Reference Number