A driver has been seriously injured in a collision involving a racing car.
Cambridgeshire Police said they were called to Duxford Airfield, home of the Duxford Imperial War Museum, at 9.26am to reports of a crash between a Formula One-style car and a lorry.
The female driver of the car is believed to have suffered serious injuries.
Gary Sanderson, spokesman for the East of England Ambulance Service, said paramedics were at the scene.
It is thought the car was taking part in testing at the time.
More top news
Protesters force cancellation of controversial 'human zoo' show which has been dubbed racist and offensive.
The Silverton family are celebrating the birth of the first baby girl in a century, breaking a streak of 21 boys over four generations.
The 100 leaders did not agree on concrete proposals, but the meeting has raised hopes for concrete international agreement next December.