A nine-year-old boy has suffered "life-threatening injuries" after falling from a coach, police have said.
Officers in Norfolk said nobody else was injured in the incident, on the A47 trunk road near King's Lynn.
The incident happened at around 3.45pm on Sunday.
A police spokesman said: "The boy has been taken to the Queen Elizabeth Hospital in King's Lynn with life-threatening injuries.
"A number of other people were on board the coach at the time and no other passengers were injured."
The road is expected to remain closed for some time and local diversions have been put in place.
Anyone with information is asked to contact police.