Police are appealing for witnesses and information after a serious road smash on the A507 Great North Road in Baldock at around 11pm on Saturday night.

The driver and three teenage passengers in a blue Citroen Saxo which was in collision with a grey Audi A6 close to the junction with Newnham Road were taken to hospital.

The driver, a man in his 30s from Letchworth, is still being treated for his injuries and is said to be in a serious but stable condition.

His passengers, also from Letchworth, included a 17-year-old boy and two 15-year-olds. The 17-year-old and one of the 15-year-olds are still being treated for their injuries and are in a stable condition, while the second 15-year-old has now been discharged.

Police say the Citroen was travelling north along the A507 and the Audi was travelling in the opposite direction when the two vehicles collided. The driver of the Audi had minor injuries and did not need hospital treatment.

A blue Lexus is also known to have been close by at the time of the collision.

Investigating officer Sgt Sam Cordingly of the Beds, Herts and Cambs road policing unit said: “I am appealing for anyone who was on the A507 at around the time of the collision and witnessed it, or the events leading up to it, to please get in touch as soon as possible.”

Anyone with information is asked to contact police via the non-emergency number 101.