A motorcyclist was killed following a collision with a car and a lorry in Ealing on Saturday.
Officers rushed to Hangar Lane at 9.22am following reports of a crash.
The male rider of the motorbike was taken to hospital for treatment. However, he was pronounced dead as a result of his injuries at 3.42pm.
His next of kin have been informed and are being supported by specialist officers.
The drivers of the car and lorry are assisting police with their enquiries. No arrests have been made.