Mandurah detectives are encouraging Greenfields and Halls Head residents to report suspicious behaviour after attending a string of burglaries in recent weeks.
Mandurah District Senior Sergeant Trevor Troy is asking Mandurah residents to report suspicious behaviour immediately.
"Greenfields is a hot spot for volume crime offences and more recently, Halls Head," he said.
"We want to identify the active offenders working those areas.
"If they can call us straight away we can more likely apprehend the offenders."
Senior Sergeant Troy said forensic evidence shows offenders from outside the Mandurah District are committing crime in the region.
The fact that offenders are being able to walk into an unlocked house astounds me.Senior Sergeant Trevor Troy
"The beach and river are obviously attracting out-of-towners in the warmer weather," he said.
"We've been working with districts as far afield as Midland, Armadale in recent weeks."
Senior Sergeant Trevor Troy said it was concerning some community members were not securing their property or homes.
"The fact that offenders are being able to walk into an unlocked house astounds me," he said.
We want to identify the active offenders working those areas.Senior Sergeant Trevor Troy
"Or steal a car because someone has left the keys on the seat.
"This could lead to other risks and put lives at danger.
"In this day and age, the public needs to start taking some responsibility."
If you see any suspicious behaviour call 131 444.