A lorry driver has been arrested on suspicion of drug-driving after three people died in a four-vehicle crash.
Police were called to the A303 near Andover, Hampshire, just after 8.40am on Wednesday.
A Vauxhall Astra, a Mercedes food delivery van, an HGV, and a DAF recovery truck were all involved in the collision.
Three people, all from separate vehicles, were pronounced dead at the scene.
A Hampshire Police spokesman said a woman aged in her 20s from Portsmouth, a woman in her 50s from Southampton, and a man in his 30s from Southampton died.
The driver of the HGV, 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 police enquiries continue.
Senior investigating officer DC Cate Paling said: "We are keen to speak with anyone who witnessed the collision, or the moments leading up to it, particularly anyone with dashcam 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."
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