Mandurah Detectives are investigating a suspected stabbing in Madora Bay.
Emergency services were called around 12.10am on Sunday, January 18 after the man in his 30s was assaulted on Britawast Road, near Addingham Road.
Police and St John WA attended the scene and found the victim with a "serious laceration type wound" to his neck.
The man was conveyed by ambulance to Fiona Stanley Hospital for medical treatment.
Detectives urge anyone with any information relating to this incident, to make a report to Crime Stoppers online at www.crimestopperswa.com.au or by calling 1800 333 000.
Reports to Crime Stoppers can remain anonymous.
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