THE Regional Investigations Unit is investigating an armed robbery at a service station in Rockingham on Monday, June 17.
A woman armed with a firearm entered the Dixon Road service station at 3pm and threatened a staff member, demanding cash.
The woman took a sum of money and left to store on foot towards Mandurah Road.
She was wearing a dark hooded jumper and grey tracksuit pants.
Detectives would like to speak to anyone who was in the area at the time who may have seen the woman. Anyone with information should call Crime Stoppers on 1800 333 000 or report online at Crime Stoppers.