West Australian police fear that a drug turf war between rival bikie gangs the Rebels and the Rock Machine may escalate into a 'cataclysmic event'.

West Australian police fear that a drug turf war between rival bikie gangs the Rebels and the Rock Machine may escalate into a 'cataclysmic event'.

It comes after police raided nine properties this morning in an attempt to stop the flow of violence between members of the two outlaw motorcycle gangs.

Assistant Commissioner Nick Anticich says police found a raft of weapons including heavy calibre guns which he believes were intended to be used in an escalation of the tensions.