A four-year-old girl has been killed in a pile-up on the M6 near Birmingham.
Seven people were taken to hospital after the crash involving a lorry and four cars. A woman in the same car as the girl who died was badly hurt.
The girl, from Birmingham, was travelling with her family when the crash happened at about 00:30 GMT.
West Midlands Police said a 63-year-old man from Sunderland had been arrested on suspicion of causing death by dangerous driving. The M6 has reopened.
The southbound carriageway was closed between junctions 4, the M42 and 4a at Coleshill but had reopened by 07:00 GMT.
The woman travelling in the same car as the four-year-old girl suffered serious head injuries, West Midlands Ambulance Service said.
She was accompanied to hospital by a man from the same car who was uninjured.
A second girl in the car, aged about eight, was treated at the scene for multiple injuries and a third girl in the car, also aged about four, had minor injuries.
Four people travelling in the other cars were not seriously hurt, and the lorry driver was also uninjured.
The family of the four-year-old girl is receiving support from specially trained officers, a police spokeswoman added.