Police are hunting a man who held up a Subway store in Waikiki.
The man, who was wearing a balaclava, entered the store on Read Street around 4.30pm on Sunday and threatened staff with a knife.
He fled with a sum of cash.
Police believe he left the area in a light coloured vehicle, possibly a 4WD, and was last seen on Gnangara Drive.
Inquiries are continuing and anyone with information is asked to call Crime Stoppers on 1800 333 000 or make a report online at crimestopperwa.com.au.