Police are searching for the driver of a small white car with black roof who may be an important witness in the A303 collision that killed three people.

Although a lorry driver has been arrested on suspicion of dangerous driving, Hampshire Constabulary are still looking for further evidence for the circumstances that led to the collision.

Police have issued a witness appeal to speak with anyone who witnessed the collision, or the moments leading up to it, particularly anyone with dash cam footage.

Senior Investigating officer DC Cate Paling said: “We are keen to hear from anyone who may be able to assist with our investigation into the circumstances of the collision.

“We are keen to speak with anyone who witnessed the collision, or the moments leading up to it, particularly anyone with dash cam footage.

“In the immediate moments after the collision, a small white car with a black roof passed the scene and we believe they may be an important witness who we wish to speak with.

“Anyone who can assist our enquiries should call 101, quoting the reference 44210338980."

Emergency services were called just after 8.40am on Wednesday to a report of a collision involving four vehicles – a Vauxhall Astra, a Mercedes food delivery van, an HGV and a DAF recovery truck.

Sadly, three people, all from separate vehicles, were pronounced dead at the scene.

Their families have been informed and are being supported by specialist officers.

The HGV driver, a 38-year-old man from Donnington, Shropshire, was arrested on suspicion of driving a vehicle while unfit through drugs and causing death by dangerous driving. He has been released under investigation while our enquiries continue.

The collision caused severe traffic around the area, turning Andover town into a gridlock for nearly 21 hours.