Kensington Detectives are seeking assistance with an incident which occurred at a fuel station on Nicholson Road on Sunday, July 2.
About 1am, a man entered the station and selected several items from the shelves before he asked the store clerk to open the doors for his friend, a woman.
As the doors opened, he forced his way out and ran.
On the way out, the pair demanded money from a victim who was refuelling his car and threatened him with a sharp object before head-butting and kicking him.
The perpetrators rummaged through the car before they fled on foot.
Police have released a CCTV image of a man and woman who may be able to assist with their investigation.