Five people were seriously injured when a coach overturned near Norwich Airport during a Christmas bus tour.
The accident happened on the A140 near Horsford at about 3.40pm on Fridaay.
Firefighters were called to the scene to free some of those injured. Many of the passengers are believed to be elderly.
A Norfolk County Council spokesman, who was at the scene, said it was a Galloway single-decker coach.
He said: "A major incident has been declared.
"Those injured have been taken to the Norfolk and Norwich University Hospital.
"Those who appeared uninjured were taken to the local village hall to be checked over there."
An East of England Ambulance Service spokeswoman said: "Ten patients have been taken to the Norfolk and Norwich University Hospital, five in a serious but not critical condition and the other five with minor injuries.
"We are also checking over a number of other patients at the local village hall."
Five ambulances and three rapid response vehicles were sent to the scene, she added.
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