Police are seeking a man involved in armed robbery at a South Lake petrol station.
Regional Investigators allege a man entered the petrol station on 17 August at 12:47am and threatened a staff member with a knife demanding cash before fleeing on foot.
The man is described as being 170 centimetres tall, with a slim build with dark brown hair and blue eyes.
He was wearing grey Everlast track pants, a floral bandana covering the lower part of his face, a high visibility long sleeved top, and a black jumper with a grey hoodie.
Anyone who can identify the person or may have information in relation to the incident is asked to call Crime Stoppers on 1800 333 000 or make a report online at www.crimestopperswa.com.au.