Inspectors from the Health and Safety Executive (HSE) are at the scene of an incident at the Royal estate at Sandringham.
A spokesman for the HSE said:
No formal investigation has been launched, but we do have inspectors at the scene with police who are making initial enquiries.
More top news
There are fears that clifftop homes at risk of toppling into the sea may put off visitors to Hemsby at the start of the tourist season.
Turning cloudy through the evening and overnight. Patchy rain and drizzle will spread in from the north affecting mainly eastern areas.
Anglia Television's longest serving newsreader John Bacon has died at the age of 83.