Mandurah Police are investigating a string of car break-ins.
Seven cars were broken into between March 30 and March 31 in Secret Harbour, Golden Bay and Port Kennedy.
"During each incident, unknown persons have used an unknown object to smash windows of vehicles, and steal personal belongings from inside," a WA Police spokesperson said.
Police believe the offenders are travelling in a blue Mazda 3 sedan.
Officers wish to speak with anyone that may have information regarding this series of break-ins, particularly if anyone saw any suspicious persons or vehicles in the areas of Secret Harbour, Golden Bay and Port Kennedy, between March 29 and 31.
Information can be reported to Crime Stoppers via 1800 333 000 or online at crimestopperswa.com.au.
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