A murder investigation has been launched in Hillingdon after a man was found in a car with fatal injuries.
Officers were called at 14:43hrs on Thursday, 11 October to Uxbridge Road at the junction with West Drayton Road.
A Mercedes was reported to have collided with a number of parked vehicles.
A male passenger, in his 20s, was found in the Mercedes suffering from a suspected gunshot injury.
London’s Air Ambulance and London Ambulance Service attended, but despite their best efforts he was pronounced dead at the scene.
His next of kin have been informed.
Formal identification awaits and a post-mortem examination will be held in due course.
No one else was found to be injured at the scene.
The driver of the Mercedes has been arrested on suspicion of dangerous driving and is currently in custody at a west London police station.
No further arrests have been made at this stage.
There are a number of crime scenes in place.
Detectives from the Homicide and Major Crime Command have been informed and are investigating. Enquiries into the full circumstances of the incident are ongoing.
Any witnesses or anyone with information should contact police by dialling 101 quoting CAD 4434/11 October. To remain anonymous please call Crimestoppers on 0800 555 111 or online at crimestoppers-uk.org.