Police are looking for a man who threatened a bus driver with a syringe in Hamilton Hill.
The man got onto the Transperth bus while it was parked in a holding area at the intersection of Rockingham Road and Carrington Street around 4.10pm on Sunday, March 14.
He then threatened the bus driver with a syringe, demanding cash, before fleeing on foot towards Carrington Street.
Fremantle Detectives would like to speak to the man pictured who they believe can assist them with the investigation.
He is described as 165 to 170cms tall, with a slim build and was wearing black pants and shirt, a black cap, a grey hoodie over his shoulders and black and white trainers.
Anyone with information regarding this incident is asked to call Crime Stoppers on 1800 333 000 or report online at wwwcrimestopperswa.com.au