A young man is thought to have been badly injured in an incident in Huddersfield.
There are unconfirmed reports he may have suffered stab wounds.
He was found when a car pulled up in Gledholt Road, Gledholt, on Saturday teatime, close to the roundabout.
Witnesses said the injured man appeared to be the driver and that there was a girl in the car.
An ambulance crew arrived to treat the man and he was taken to Huddersfield Royal Infirmary .
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Police sealed off a stretch of road at the the top of Gledholt Road and an investigation was launched.
Forensics experts searched the car and scenes of crimes officers took photographs.
One eye-witness said: "The scene was sealed off for a few hours.
"We were told the driver had pulled into the roadside and the ambulance was very quickly there behind him."
A group of young men also turned out up a short time later."