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A 23-year-old man died when a car he was travelling in hit a lamppost during a police chase.
Another passenger and the driver were also hurt in the crash at about 01:30 BST in Colne Road, Burnley, Lancashire Police said.
The car "had been requested to stop by the police and was being followed", a force spokesperson said.
The crash has been referred to the Independent Office for Police Conduct, which has started an investigation.
The injured people are being treated in hospital.