An unexploded World War Two bomb was taken to Bangor police station by a member of the public, police have said.
The mortar was found in Coed y Wenallt at Nant Gwynant on Tuesday and handed to officers.
Bomb disposal experts carried out a controlled explosion at Brewery Fields in the city on Wednesday morning.
A North Wales Police spokesman said officers cordoned off the area to ensure there was no danger to the public.
Sergeant Emma Williams at Bangor Police Station said: “Yesterday afternoon a member of the public out walking in Coed y Wenallt, Nant Gwynant, found what is believed to be a Second World War mortar bomb which was later brought to Bangor Police Station.
“Experts were called from the North West EOD (Explosive Ordnance Disposal) who attended this morning, Wednesday February 15, and used a controlled explosion to safely dispose of the item in Brewery Fields, Bangor.”
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