A bomb disposal squad was called to a beach in Devon last week after a suspected explosive was found in rock pools.
A member of the public called the Westward Ho! Coastguard to the scene after spotting the object.
After the coastguards assessed it they called the bomb disposal team from Plymouth who arrived, who arrived on the scene at around 1.30pm last Thursday.
After investigating, they found that the object was actually a catalytic converter from a vehicle's exhaust, and it was then disposed of by the team.
Derek Jones, the Coastguard sector manager, told This Is North Devon: "We urge members of the public to call us on 999 if they see anything they think could be a bomb because we get a lot of Second World War ordnance in this area.
"It is hard to tell as most of them are so corroded and covered in barnacles so it is better to be safe."
Just last month, a young boy was very "fortunate" to escape injury after picking up a live World War II mortar shell while playing on a beach in Northern Ireland.
The young child found the bomb while he was walking along the shoreline around Magilligan, County Londonderry, on a Saturday afternoon.
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