Hunstanton Coastguard Rescue Team were called to a report of an object on Holme beach on Thursday January 25.
Working with Norfolk Police they sent photos to the Explosive Ordnance Disposal Unit.
It led to the unit being called in the following morning and carried out a controlled explosion.
The Coastguard said: “Please if you come across anything suspicious on our beaches, please call 999 and ask for the Coastguard.”
Here is the moment it was blown up: