The man was wearing a bullet-proof SWAT vest and brandishing what appeared to be an assault rifle outside Linneys Jewellery store this afternoon, they were told.
King Street in the city was quickly shut down as detectives pounced on their suspect.
But all wasn’t quite as it seemed.
As officers spoke to the man, it became clear they weren’t dealing with an armed robber but rather an adult entertainer.
The 31-year-old was booked for a nearby party and in the middle of preparing his costume.
It included a SWAT vest, and while the gun wasn’t a rifle, officers believe it is a gel blaster, which are illegal in WA.
The man was arrested while police inspected the weapon and worked to determine whether he would face charges.