Two teenagers have died and a man is in a critical condition after the car they were travelling in hit a tree.
A 17-year-old girl, who was driving, and a 17-year-old boy were pronounced dead at the scene near Rotherham, South Yorkshire Police said.
A second passenger, an 18 year-old man, was seriously injured and remains in hospital.
Police were called at 02:40 GMT after the silver Toyota Corolla, which was travelling on Todwick Road between Dinnington and Todwick, left the carriageway.
Sgt John Taylor said the victims’ families were being supported by officers.
“We are working to ascertain the circumstances and are keen to speak to anyone who believes they can help,” he said.
He urged witnesses or anyone with dashcam footage to get in touch.