Lake Macquarie police are investigating the discovery of a military grade smoke grenade and a flare at Belmont South.
Officers were called to an address on the Pacific Highway at about 9.00pm on Wednesday.
The Police Rescue Squad was also called to the scene and rendered the devices safe before taking them to safe storage.
A quantity of 12 gauge shotgun ammunition was also found.
No charges have been laid at this stage and inquiries are continuing.
