An investigation has been launched into how police officers called to the scene of a car crash in East Yorkshire failed to spot a man's body nearby.
Officers found a grey Rover 216 in a ditch on the A165 Bridlington to Hull road at around 0545 BST on Wednesday.
But it was not until 0920 BST that a member of the public reported seeing a body behind a hedge near the car.
Humberside Police have referred the incident to the Independent Police Complaints Commission.
They have also appealed for anyone who may have seen two men running from the crashed Rover to contact police.
The two men then got into a red Toyota Corolla and drove away from the scene, between the villages of Beeford and Lissett, towards Bridlington.
A Humberside Police spokesman said: "Officers attended the scene and found a car in the ditch but no one was in the car.
"The car was left in situ until further enquiries were made with the registered keeper."
The road was closed to traffic at Beeford and Lissett to enable an investigation.
The victim, who is described as being in his early 20s, appears to have sustained head injuries and how he received those injuries and whether he was an occupant in the car are being investigated.
A post mortem examination was expected to be carried out on Wednesday.
Forensic examinations of the Rover have revealed that the driver may have suffered an injury that required medical treatment, police added.