Thames Valley Police say a man's died after a collision at Ledburn in Buckinghamshire. The crash involved a farm vehicle and three cars. One car driver, a 46-year-old man, was killed, the other two drivers are in Addenbrookes Hospital in Cambridge with serious injuries.
Police want to speak to anyone who was driving along the road around the time of the collision. Officers would also like to trace a man who stopped just after the collision and spoke to the driver of the farm vehicle. They believe he was driving a blue or grey medium-sized hatchback.
Sergeant Jim Lovell of the Joint Roads Policing Unit based at Three Mile Cross can be contacted via the 24-hour police enquiry centre on 101. To contact Crimestoppers anonymously call 0800 555 111 or visit www.crimestoppers-uk.org.