A Mercedes with a gun hit by a gun crashed into a crowd of people in the west of London.
Police said the male passenger was declared dead on the Uxbridge Road scene in Hillingdon by a "gunshot wound" despite the efforts of the paramedics.
The victim had been driven into a silver car that unleashed unchecked and collided with pedestrians and vehicles around 14.45 on Thursday.
Paramedics rushed to the scene at the intersection with West Drayton Road but none of the pedestrians were seriously injured.
The Mercedes driver stopped at the scene.
James Carson, who heard a "big bang" from his mother's backyard, said that a woman had remained in the middle of the street after being hit.
He told the Standard: "The doctors were treating the woman in the middle of the road and she seemed in a bad way.
" There were five or six vehicles involved and the front of the Mercedes was very bad  Police on the scene in Hillingdon in which a man was shot dead with a firearm (@ JamesCarsxxx / Twitter)
"Another woman was sitting on the side of the road with a blanket wrapped around her that seemed to be in shock"
"I saw them pulling the passenger out of the Mercedes and putting him on a bed e
The family of the firearm victim was informed
The officers erected a cordon around the scene of the accident, at the intersection with West Drayton Road, while the traffic was diverted from the # 39; area.
An aerial ambulance was sent to the scene and three people were taken to the hospital with minor injuries
A crime scene was erected outside the Lidl supermarket on Uxbridge Road, with buyers claiming to be detained Inside the parking lot by the police.
One person said, "We were all kept inside the Lidl car park while the police had registered entry to the Mecca bingo hall."
Police said a man was arrested on suspicion of dangerous driving. There were no arrests in relation to the shot, police said.