Police are appealing for more information on a string of robberies at service stations in Beldon, Malaga and The Lakes last week.
At 11.30pm on Sunday, May 26 two men, one armed with a handgun and another with pepper spray entered a service station on Ocean Reef Road, Beldon.
One of the men sprayed pepper spray at the staff member before both men left the store.
It is believed no items were stolen.
The second incident occurred 40 minutes later at a service station on Beach Road, Malaga.
One of the men used pepper spray on the staff member before both men left the store with a sum of money.
At 2.40am on Monday the men attended a service station along Great Eastern Highway, The Lakes.
A staff member was threatened but received no injuries.
The men left the store with a sum of cash and cigarettes.
The three staff members did not require medical attention and no series injuries were received during any of the incidents.
The first offender is described as male, fair skinned with a medium build and blonde hair.
Police said he appears to be approximately 170cm tall.
The second offender is described as male, fair skinned with a medium build.
He had a beard and moustache and is approximately 180-185 cm tall.
Detectives believe the men were switching items of clothing before each robbery.
Police said the offenders parked their vehicle a distance away from the crime scene locations and approached on foot.
The three incidents are believed to be linked and detectives would like to speak to anyone who may have information regarding these incidents.
Police would like to speak to anyone who witnessed any of the three incidents, in particular, the driver of a blue Mitsubishi Magna who attended the service station on Eddystone Avenue in Beldon.
Police said the driver approached the entry doors of the building before realising what was going on and drove off.
If you have information on any of the incidents contact Crime Stoppers on 1800 333 000 or report online at crimestopperswa.com.au.