Victorian Police say they have made a significant breakthrough in their investigation into a feud between rival outlaw motorcycle gangs.
Police warned the public of escalating tensions between the Hells Angels and Bandidos bikie clubs after Bandidos enforcer Toby Mitchell was shot during a fight at Melton, west of Melbourne, in March.
They established Operation Resound to deal with a potential violence stemming from that incident.
Victoria Police Chief Commissioner Ken Lay says investigators made a breakthrough overnight in connection with the Mitchell investigation.
Raids were carried out at Frankston, Seaford and Beaconsfield and a vehicle from one of the properties has been taken for forensic examination.
A 57-year-old Frankston man was arrested and questioned over the Mitchell shooting.
The man has been released pending further inquiries.
Commissioner Ken Lay says police are continuing their investigations into outlaw motorcycle gangs.
"What we are starting to understand is the insidious reach of outlaw motorcycle gangs. They're not only in the drug, the prostitution, the burglary, the thieving place, but they are also in more legitimate businesses now, like the security industry, like the liquor licensing industry.
He says 35 warrants have been executed in the last few months and a whole host of people have been arrested on firearms and drugs charges.