Intruders escaped with weapons in a raid on an Australian navy vessel.
The theft of weapons from the patrol boat moored at this base near Darwin is being treated as a national security breach.
Intruders got onto the boat and overpowered a sailor on board to reach the weapons.
Australia's Chief of Navy says they're looking at all angles including security.
Australian media reports say the type of patrol boat targeted by the thieves would normally carry weapons including machine guns, assault rifles, shotguns, and ammunition.