Mandurah Detectives are investigating damage to numerous vehicles at three car dealerships along Pinjarra Road.
The incidents took place between 11pm on January 7 and 12.15am on January 8.
The vehicles had damaged windscreens, a couple with bonnet damage and one with a rear window smashed.
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If you have any information about these offences make a report online at crimestopperswa.com.au or call Crime Stoppers on 1800 333 000.
Calls are strictly confidential.