A woman who was arrested after three people died in a single-vehicle crash on the A46 in Leicestershire has been released under investigation.
Emergency services were called shortly after 01:00 GMT on Saturday after a blue BMW 5 series left the road between Thrussington and Sileby.
Leicestershire Police said the car was travelling southbound from Nottingham when it left the dual carriageway.
A 37-year-old woman was detained on suspicion of causing death by dangerous driving and has since been released from police custody under investigation while inquiries continue, the force said.
The force said it was informed of the crash by a fourth person in the car, adding she suffered minor injuries.
Police said detectives from the serious collision investigation unit have been at the scene since the crash, gathering evidence to establish what happened.
The A46 was closed in both directions and has since reopened.
Det Con Madeleine Hayes said it was a “tragic incident with three people losing their lives” and appealed for information.
“We know the car was travelling on the A46 from Nottingham,” she said.
“We are working to understand what led the car to leave the carriageway and any information from witnesses may be helpful in establishing this.”
Det Con Hayes asked people to view their dashcam footage from between 00:30 and 01:05 and contact police with any information.