Invercargill police want to speak to anybody who has information about flares that were let off last night near Te Anau.
Shortly before 10pm, police received reports of three red parachute flares being sighted between the Te Anau township and Dome Island.
Search and Rescue were advised, and Southern Lakes Helicopters assisted a night search, where night vision and thermal equipment was utilised.
Enquiries with people camping in the area did not lead to the source of the flares, and no distress calls were received by Maritime Radio.