Road re-opened after an accident involving two cars and a mini-bus.
Four fire engines and police were on scene earlier today on the B1150 Norwich Road in Westwick near the junction for Swanton Abbott.
A spokesman for the Norfolk Fire and Rescue Service said: 'We can confirm that the incident involved a Norfolk Fire and Rescue Service minibus which was returning to North Walsham fire station with 6 young adults who had been on a Princes Trust training day. None of them, all of whom are over 18, were injured, but one of the trainers sustained a minor injury.'
A spokesman for the East of England Ambulance Service said four people had been injured, three people with minor injuries.
The fire crews used rescue equipment to release one man who was trapped.
He was complaining of back pain and was taken to the Norfolk and Norwich University Hospital for treatment.
Those with minor injuries were not taken to hospital.
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