A seven-year-old boy died and four members of his family were seriously injured when their car was in collision with a lorry in Kent.
Police said the family, from Leeds, were on the London-bound carriageway of the A20 at Saltwood when the crash happened at 09:30 BST on Friday.
The boy was pronounced dead at the scene. Two other children and their parents were flown to London hospitals.
Kent Police said the two children remain in a critical condition.
Both parents are in a stable stable condition. The lorry driver, who was taken to a local hospital, suffered hand injuries and is also said to be stable.
Police have appealed for any witnesses to the crash near Hythe, between the family's Kia Soul car and a DAF lorry, to come forward.
A spokesman said officers had now traced and spoken to the driver of a blue vehicle who stopped at the scene to help direct traffic.
The A20 was closed in both directions until 14:40.