Four people have been arrested on suspicion of murder after two people died in crash involving three cars.
The crash occurred near Leicester on the A46 close to the Six Hills junction at 1.35am on Friday.
The cars involved were a silver Skoda Fabia, a grey Audi TT and a blue Seat Leon and Leicestershire Police believes they were all travelling at speed.
Two people were pronounced dead at the scene.
A 20-year-old man from Stoke, a 21-year-old woman from Birmingham, and two more women, aged 45 and 22, have been arrested and remain in police custody.
Detective Chief Inspector Tony Yarwood from East Midlands Special Operations Unit appealed for anyone travelling in the area in the early hours, especially who might have dashcam footage, to come forward.
He said: “We are working to piece together the movements of all the cars involved and any footage of them will help our investigation.”
A post-mortem examination has not yet taken place.
The force said it wants to hear from anyone who saw three cars travelling in the area of Troon Way or Abbey Lane at around 1.25am, and on the A46 between Thurmaston Shopping Centre and the Hobby Horse Island.