Police are investigating the death of a motorist who was hit by two cars shortly after getting out of his vehicle and being involved in an altercation with another driver.
Detectives are hunting the two drivers who failed to stop at the scene in Wandsworth, south west London on Friday night.
Scotland Yard said two other vehicles - a Nissan Micra and a Ford Fiesta - had pulled up at the location, and the drivers had their left their cars before being involved in the fracas.
The 40-year-old driver of the Nissan was then hit by two vehicles that failed to stop.
Officers were called at about 11.40pm to reports of a traffic incident at the junction of Trinity Road and Magdalen Road.
The victim was taken to a south London hospital, where he was pronounced dead at 1.53am, police said.
A spokesman said it was thought that the man's identity was known, but formal identification was awaited. Next of kin have been informed.
A post mortem examination will take place today.
"It is believed that the man was the victim of an assault prior to being in collision with two vehicles that failed to stop at the scene," the spokesman said.
"A 25-year-old man has been arrested on suspicion of assault and is in custody at a south London police station."