Police are raiding 18 Sydney properties believed to have links to bikie gangs the Hells Angels and the Nomads.
The raids began early on Friday morning and are ongoing, a State Crime Command spokeswoman told AAP.
State Crime Command has joined forces with local police and officers of Strike Force Kinnarra, formed in April to investigate shootings believed to be linked to outlaw motorcycle gang conflict.
The spokeswoman said it was too early to say if any arrests had been made.