A mum and son accidentally drove home with a bomb in their car after finding the device on a Mother's Day fishing trip.
The rusted object was reeled in by the son using a magnet fishing kit while on the day out in Helmsley, North Yorkshire.
It was initially thought to be farming machinery or part of an old camping stove, with the woman and her child bringing it home to investigate it further.
However, on Monday concern grew about the device and police were called, Hull Live reports.
The British Army's Royal Logistic Corps bomb disposal squad were then brought in and after examining the object, confirmed it as a British practice mortar shell.
Trained experts then took the bomb to be safely disposed of.
The grandmother of the bomb discoverer got in touch with Hull Live to share the story and said: "My daughter contacted me last night to tell me the bomb squad was on their way from Catterick after she contacted the police about something my grandson had found whilst magnet fishing in Helmsley on Mother’s Day.
"At first they thought it might be part of an old camping stove or farm machinery, it turned out to be an unexploded ww2 mortar bomb. This will be one Mother’s Day outing and treat she won’t forget.
"The army disposal x-rayed it and took it away, said it was a practice mortar apparently."
The police reportedly identified the object as possible ordnance and sent a picture to the bomb disposal squad at Catterick.
A Humberside Police spokeswoman confirmed the officer call-out on Monday evening to north Hull "following reports that a suspected WW2 explosive device had been found".
"The Explosive Ordnance Disposal Team attended and safely removed the device from the property."
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