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Violent exchanges involving weapons resulted in police and ambulance crews being called to a road in Kemsing, near Sevenoaks.
Men who were driving in a Range Rover assaulted the driver of a Vauxhall Corsa with baseball bats or crowbars in Childsbridge Lane this evening.
The assault occurred shortly after the two vehicles collided near where the lane crosses a railway line.
The occupants of the white Range Rover drove away from the scene before police arrived.
A man who witnessed the incident, who preferred not to be named, said: "We heard a load of shouting and it sounded like there was a car getting smashed in.
"It looked like a load of guys had jumped out of a car and were attacking a couple of people.
"It looked like they had dragged them out of the car - it can't have just been road rage.
"When the other car drove off, we got out to check that everyone was ok and another guy had already called the ambulance.
"It looked like they had had a kicking, and the guys were swinging - they were definitely weapons - either baseball bats or crowbars."
A motorist who was prevented from getting through to Kemsing said there "was a huge amount of police and ambulance activity".
"It looked to me like there were at least five police cars and three ambulances," they added.
"There were three police cars behind me that got past before everyone started turning round."
The injuries sustained by the victim are not thought to be serious.
A police spokesman said: "We were called to Childsbridge Lane, Kemsing, at 6.51pm on Wednesday following a collision involving a Vauxhall Corsa and a Range Rover.
"It is reported a person travelling in the Corsa was assaulted shortly after the collision and that the occupants of the Range Rover left the scene prior to police arrival.
"The victim did not suffer any serious injuries. No arrests have yet been made."