A woman has died and another has been seriously injured in an alleged hit-and-run in west London.
The two women were hit by a black Range Rover shortly after 9.30am on Tuesday in Green Lane, Hounslow.
Video posted on social media shows an air ambulance land in a playing field near the scene, as a large police cordon is put in place.
Danny George, 46, lives opposite where the crash happened.
He was carrying out renovation work in his house and only found out about the incident when police knocked on his door.
He said: "It was complete carnage. There were ambulances, police and an air ambulance landed in the field on the other side of the road.
"The road was completely blocked off, the traffic was at a standstill."
The women, believed to be aged in their mid-20s, were rushed to hospital.
One has since died. Her next of kin have been informed.
The other remains in hospital with life-changing injuries.
Mr George, who has lived on the road for four years, added: "There have been so many near misses on that stretch of road, I'm suprised something like this hasn't happened sooner."
The Met Police, London Ambulance Service and London’s Air Ambulance all attended the crash.
The car did not stop at the scene, but was stopped shortly afterwards.
The driver, aged 39, was initially arrested on suspicion of causing injury by dangerous driving and taken to hospital.
He has since been discharged and taken into custody. He has been further arrested on suspicion of causing death by dangerous driving.
A Met Police spokeswoman said the Serious Collision Investigation Unit is carrying out enquiries into the circumstances of the incident.
Anyone with any information is asked to call the witnesses line on 0208 543 5157. To give information anonymously contact Crimestoppers on 0800 555 111 or crimstoppers-uk.org.
