A young girl is fighting for her life after the car she was in collided with a train on an unmanned railway crossing.
The child was airlifted to hospital and is in intensive care following the incident in North Nottinghamshire.
The driver, a 67-year-old woman, was taken to hospital in nearby Doncaster with neck injuries and bruising.
A British Transport Police (BTP) spokesman said: "The child, a four-year-old girl, sustained serious injuries and has been airlifted to hospital in Sheffield, where she is in intensive care."
The level crossing is located close by Robin Hood airport and the incident was first reported to the BTP at around 12.35pm.
Sky's Frazer Maude, reporting from the scene, said debris could be seen as crash investigators worked under floodlights into the night.
"BTP officers were called to the rail line at Beech Hill crossing, Springs Road, Misson Springs, Nottinghamshire, following a report of a train striking a car," the BTP spokesman said.
There were no other occupants of the car and no passengers on the train were hurt in the incident.
"The train, a Lincoln to Doncaster service, was damaged but has remained upright and on the tracks.
"Passengers were removed from the train and there are no reports of injuries," the spokesman said.
"Officers are working to establish the full circumstances surrounding the incident, including how the vehicle came to be on the tracks.
He added: "This will include establishing whether there were any witnesses to the incident, while specialist officers will also examine the scene and the car in question.
"The Rail Accident Investigation Branch (RAIB) and Office of Rail Regulation have been notified."