A man has died after his car hit a wall shortly after being signalled to stop by a police car.
A Renault Clio crashed into a post and then hit a wall on Buncer Lane in Blackburn at about 04:30 GMT on Saturday, Lancashire Police said.
The 24-year-old driver was taken to Royal Blackburn Hospital but was pronounced dead.
Police said the incident had been referred to the Independent Police Complaints Commission (IPCC).
Ch Insp Jon Bullas said: "This is a tragic incident and an investigation into the circumstances surrounding the collision is under way.
"Our thoughts and condolences are very much with the family of the man who has sadly died at this time."