Police have released two images of men they want to apprehend after a Mandurah Forum employee was threatened with a wine bottle on Monday.
The Mandurah Mail reported last week on two incidents of assaults on retail staff, with the police union saying the violence had to stop.
Mandurah Detectives are searching for two men they say became violent with a Mandurah Forum Liqourland employee, after attempting to steal alcohol about 2pm.
Mandurah Detective Senior Sergeant Trevor Troy said "a scuffle" resulted after the attempted theft.
"One male selected a carton of Jack Daniels and attempted to leave the premise, before being confronted by an employee," he said.
"The victim was thrown to the ground.
"The suspect picked up bottle of wine and threatened the victim with the bottle of wine while standing over him."
Senior Sergeant Troy said the second offender grabbed a carton of Jack Daniels whisky, before both suspects left the store.
"We have CCTV footage and hope to be able to identify the two males, but we ask for information from any one who witnessed the incident," he said.
The first man is described as fair skinned with a medium build, approximately 165-170cm tall. He was last seen wearing a camo hat, light coloured blue shorts and a grey shirt.
The second man is described as fair skinned, slim build, approximately 175-180cm tall. He was last seen wearing a dark coloured hat, white shirt and black shorts.
He was wearing a white top with an Australian flag.
Senior Sergeant Troy said the WA Police Commissioner Chris Dawson had commissioned an initiative to tackle retail theft.
"We will leave no stone unturned when going after shoplifters and any one who resorts to this sort of violence against employees," he said.
"They will feel the full force of the law.
"We ask for the harshest of penalties when they resort to violence."
Senior Sergeant Troy encouraged employees to ask property be returned, but avoid physical confrontation.
Anyone with information is asked to contact Crime Stoppers on 1800 333 000 or make a report online at crimestopperswa.com.au.