Armed officers were called to a Spar in Rhyl after reports of a man with a firearm last night.
North Wales Police say they arrested a man at a nearby house and recovered an imitation firearm.
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Heavy rain and thunderstorms will affect many parts of Wales this weekend - particularly during Saturday evening.
A paddle steamer has sunk off the north Wales coast while it was being towed towards Northern Ireland.
The heavy rain will ease overnight, with mist and mild temperatures!