A teenager has died in north-west London following a head-on collision between two cars.
The 18-year-old was a passenger in a Ford Fiesta which struck a BMW in Cuckoo Hill in Pinner on Saturday.
He was pronounced dead at the scene and the 17-year-old driver of the Fiesta remains in a serious condition in hospital.
A 25-year-old woman passenger in the BMW was treated in hospital for non-serious injuries.
Police are appealing for witnesses to come forward.