A 14-year-old boy has fallen out of the window of a double-decker bus.
Cambridgeshire Police said it was called at about 15:50 BST to the incident in Doddington Road, Wimblington.
It added that the boy's injuries were "unclear at this stage" and did not specify which level of the bus the boy reportedly fell from.
An East of England Ambulance Service spokesperson said the boy was transported by road to Peterborough City Hospital for further treatment.
Steve Ekins, who lives near to where the incident took place, said: "I was sitting down watching the box and I heard a bang - like glass breaking.
"When I looked out the window I saw a guy laying in the road and called 999."
He said police officers and the bus left the road at about 17:45.
Doddington Road has now been reopened.
An East of England Ambulance Service spokesperson said: "We were called at 15:45 with reports that a teenage boy had fallen out the window of a double-decker bus in Doddington Road, Wimblington.
"An ambulance, ambulance officer vehicle and the Magpas Air Ambulance were sent to the scene. The boy was transported by road to Peterborough City Hospital for further treatment."
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