A driver pulled out what police believe to be a handgun after crashing into another car on the M25 near Gerrards Cross on Sunday.

A man was driving along the motorway clockwise between junctions 15 and 16 at around 7.30pm on September 27 when he noticed another man driving erratically behind him.

The driver behind, in a silver Mercedes, was lane-swapping and pulling alongside the victim’s vehicle before the car crashed with the victim’s vehicle.

The driver of the silver Mercedes then pulled out what appeared to be a handgun and pointed it at the victim.

The offender is described as a white man aged in his mid to late thirties with spiky hair.

Thames Valley Police are appealing for witnesses to come forward with information.

Investigating officer, Det Con Chris Downs, from Force CID based at Aylesbury police station, said: “We are taking this report of a suspected firearm being seen on the M25 very seriously and are conducting a thorough investigation.

“If anyone saw the offender’s vehicle either before or after the incident, or has any other information which could help with this investigation, please get in touch as soon as possible.”

Anyone with information is asked to call the Thames Valley Police enquiry centre on 101.

To give information anonymously, contact Crimestoppers on 0800 555 111.

No personal details are taken, information is not traced and you will not have to go to court.