A woman was taken to hospital in a critical condition after a multi-vehicle collision on the M1 in the East Midlands.
The road was closed overnight and many drivers were stuck for hours.
Leicestershire Police have confirmed the incident involved five cars and two heavy goods vehicles.
A woman in her 30s, who was driving one of the cars, was taken to Nottingham's Queen's Medical Centre with serious injuries. Leicestershire Police confirmed she is in a critical but stable condition.
Three other people – a driver and two passengers who were in other cars involved in the collision – were also taken to hospital with injuries. Their injuries are not believed to be life-threatening or life-changing.
An investigation is now underway with detectives from the force's serious collision investigation unit.
Detective Sergeant Ed Des-Chanelle said: “A section of the motorway has remain closed this morning as we continue our investigation to understand the full circumstances of this collision.
“We are speaking to a number of witnesses but continue to appeal to anyone who has any information and who has not yet spoken to us to make contact.
“Anyone who witnessed the incident is asked to make contact with us. If you have any dashcam footage from the area from around the time of the incident, you should also get in touch.”
Anyone with any information should contact 101 quoting incident 902 of 26 March.
