Police are hunting for a motorist who got out of his car and stabbed another man to death after they crashed their vehicles last night.
The stabbing took place at the scene of the crash at Findon in West Sussex. Police are searching for a white man aged between 30 and 40, who is around 6' tall with shoulder-length brown hair.
The 79-year-old victim, whose identity has not been revealed, died at the scene.
A police spokesman said: "A suspect who was in the car in front got out and stabbed the driver of the other car. The air ambulance landed and paramedics carried out first aid on the victim but he died at the scene.
"The suspect got back in the vehicle and drove off. Inquiries are ongoing to trace the suspect. The A24 is currently shut in both directions by the Black Horse pub."
Detective Chief Inspector Karen Mizzi said this morning: "Officers have been urgently making enquiries overnight to trace the suspect. We need to hear from witnesses who saw the collision, the suspect or the car involved, particularly if anyone filmed the incident or saw anyone filming it."