A 10-year-old boy has died after part of a tree fell on him, police said.
Three other children were hurt in the accident at Felbrigg, Norfolk, said a police spokesman.
Officers said the accident happened this afternoon and police were investigating. The police spokesman said the three injured youngsters were being treated in hospital.
He said the children were on a school trip, visiting a country estate. Police said the four youngsters were pupils at a school in Colchester, Essex.
The spokesman said they were part of a group of youngsters on a school trip to the Felbrigg Hall estate. He said officers were trying to establish whether the accident was weather-related.
"That's something we will be trying to establish," he said.
"It has been windy overnight and today in the country but we have not had widespread reports of trees falling. We did have one report of a tree falling overnight at King's Lynn but nothing widespread."
He said the three injured children were being treated at the Norfolk and Norwich Hospital in Norwich. Their conditions were not known.
The spokesman said the remaining children on the trip were being returned to their homes in Colchester.
He said the pupils on the trip were aged either 10 or 11.
