A man and woman have been killed in a collision on the M6 motorway in Lancashire.
Another car involved in the crash - an Audi A4 - was driven away, but five people were later arrested on suspicion of causing death by dangerous driving.
The collision happened near junction 31A northbound for Longridge shortly before 22:00 GMT on Sunday.
The two people killed were the 58-year-old driver of a Vauxhall Vectra and her 57-year-old male passenger.
Lancashire Police said two men, aged 22 and 24, from Wakefield, a 21-year-old woman from Abergavenny and a 24-year-old man from Ossett, West Yorkshire, were being questioned.
A fifth person, aged 18, who was also arrested, was taken to hospital with a broken arm, said police.
The drivers of two other vehicles which were subsequently involved in the crash - a Volkswagen Transporter and a Citroen CX Athena - were not injured.
Police are urging any witnesses or anyone with information about the crash to come forward.
The motorway was closed for more than six hours.