The Defence Force has safely detonated a marine marker flare on Motukorea/Browns Island – with the blast heard by residents as far away as Howick.
The New Zealand Defence Force told 1News it responded to a request for assistance from the police on Motukorea/ Browns Island where an "item of concern" had been located.
The Explosive Ordnance Disposal team investigated and determined the item to be a marine marker, which was "disposed of in a safe manner" at around 12.30pm.
Marine markers typically contained phosphorus and an explosive charge.
Dropped from aircraft or launched from ships, they were often used in search and rescue missions, anti-submarine warfare and maritime research.
Chris Murray, who was walking his family dog at Mellons Bay, said he looked north after hearing a "loud boom" and saw a puff of smoke, capturing the moment on camera.
The explosion was heard as far away as Howick Beach, around 8km to the southeast.
NZDF said anyone who discovered a potentially dangerous item should always exercise caution until the item was cleared as safe by an expert.
"If you do discover something that might be dangerous, remain clear of the item and contact New Zealand Police as soon as possible," they added.
Motukorea/Browns Island is a small volcanic island north of Musick Point. The uninhabited island is part of the Hauraki Gulf Marine Park and is a popular spot for boaties and walkers.
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