Gang Crime Squad detectives are investigating an incident that occurred on Hammond Road in Cockburn Central on Thursday 15 September.
About 6:30pm, a male in his 30s was assaulted by a group of men outside a licensed premises.
The man received serious injuries and self-presented to hospital after the incident.
It is believed the parties involved have Outlaw Motorcycle Gang (OMCG) links.
Anyone with information or CCTV/mobile phone vision is asked to contact Crime Stoppers on 1800 333 000 or report online at crimestopperswa.com.au
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