Recently-installed road signs from the Queen's Sandringham estate have gone missing.
West Norfolk council is seeking information from the public to trace missing street name plates in Castle Rising and Sandringham.
A council spokesman said replacement of the street signs will take place in the coming weeks at a cost to the tax payer.
Councillor Richard Blunt, cabinet member for development at the borough council, said: 'People may not be aware that it is a criminal offence to tamper with, deface or remove street name plates without the permission of the local authority. If found guilty, culprits would be subject to a fine.'
'Street name plates are paramount in assisting the emergency services to locate address quickly and efficiently. In some cases this can be a matter of life and death.'
Anyone who might have information about these signs is urged to contact the police on 101.
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