Police are appealing for witnesses after a serious head-on collision involving three cars at Hartford on Thursday evening that left one driver with what have been described as life-threatening injuries.

The man, who is in his 40s and was driving a Vauxhall Corsa, suffered serious injuries and is in a critical, but stable condition in Addenbrooke's Hospital, Cambridge.

The collision happened on the A141 at 5.30pm and involved a green Vauxhall Corsa, a green Renault Megane and a silver Audi A4.

A second man, driving the Audi, suffered serious injuries and the female driver of a Renault was uninjured.

PC Stephanie Corletto, of the Roads Policing Unit, said: "I am appealing for witnesses to the moments leading up to the collision and the collision itself. I urge anyone with information to come forward."

The East of England Ambulance Service and the Magpas rapid response vehicle were sent.

A spokesman for Magpas said: "An East of England Ambulance Service Trust paramedic crew safely removed a man in his 40s from the car he was in.

"The Helimedix team anaesthetised the patient, providing him with specialist A&E care at the roadside.

"The Magpas team then accompanied the patient, by land ambulance, to Addenbrooke's Hospital - continuing to give him enhanced critical care all the way there.

"On arrival at the hospital, the man was in a critical but stable condition."

INFORMATION: Anyone with details about the collision should contact PC Corletto on 101, quoting incident 426 of May 21.