Police have launched an appeal for dash cam footage after a man in his sixties was killed in a fatal collision in west London early Tuesday morning.
The pedestrian was killed in the collision with a car in Greenford Road with the junction of Army Road, Greenford around 5.35am.
Police were called and the man, in his early sixties, was pronounced dead at the scene.
The car did not stop at the scene, police said, but the vehicle was located nearby afterwards.
Four men have been arrested on suspicion of offences including causing death by dangerous driving and drink driving.
Enquiries are underway to inform the man's next of kin.
Road closures remain in place at the scene while detectives from the Met's Serious Collision Investigation Unit investigate.
Police appealed for any witnesses or those with dash cam footage to contact them on 101, quoting crime reference 2459/15FEB.
Information can be given anonymously to Crimestoppers on 0800 555 111 or by visiting crimestoppers-uk.org.