A 23-year-old woman was found dead in the middle of busy road and no cars stopped to help, police say.
Police were called to Wood Lane, near the Westway in London after the discovery of the woman's body at 9.56am this morning.
Roads around the area were closed as an investigation was launched.
Police said no vehicles stopped at the scene of the incident in West London.
In a statement, the Metropolitan Police said: "Police were called to Wood Lane near the junction with the Westway (A40) at 9.56am on Tuesday, 19 October following reports of a person in the roadway.
"Officers attended with London Ambulance Service paramedics and found a woman, believed to be aged 23, who was pronounced dead at the scene.
"Initial enquiries suggest her injuries were caused as a result of a road traffic collision. No vehicles stopped at the scene and an investigation is under way.
"Local road closures are in place, including the Westway westbound and motorists are encouraged to avoid the area."
Anyone who witnessed a collision should call 101, giving the reference 2081/19OCT.
Drivers are also being asked to check dashcam footage that may have recorded any part of the incident.
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