Bomb disposal experts were called out after an explosive device washed up on a Northumberland riverbank.
The mortar round was discovered by a local man while walking alongside the rain-swollen River Coquet near Amble on Monday morning.
It was initially thought the device could have been a dummy bomb lost by an RAF Tornado earlier this year.
But the Ministry of Defence said the shell, which was not live, had no connection to the incident.
In October the Tornado, from Scotland's RAF Lossiemouth accidentally dropped a practice bomb during an exercise.
The concrete device, which is not explosive, was never recovered.
It was lost during a 90-minute training sortie, which took the jet across north-east Scotland, Northumberland and out to sea.
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