Detectives are seeking information regarding an armed robbery in Barragup on Sunday, June 5.
About 6.25am, a man armed with a knife entered a service station on Watson Drive.
He threatened a staff member, demanding cash.
The man ran from the store after being given a sum of cash.
He is described as being 35 to 40 years of age, fair skinned, about 173cms tall, with a medium build.
He was wearing a grey hooded jacket, beige pants, gloves and sneakers.
His face was covered with a bandana.
Anyone with information regarding this incident is asked to call Crime Stoppers on 1800 333 000, or report the information online at crimestopperswa.com.au.