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A woman was bottled after a Kent festival.
Police are investigating following reports of disturbances following the Matt's BBQ festival in Wrotham yesterday.
Traffic before and after Matt's BBQ festive in Wrotham
Police said the assault took place in a car park off London Road, at around 6pm, after heavy traffic built up outside the event.
The victim, a woman in her 20s, was taken to a local hospital for treatment after being hit with a bottle.
A 29-year-old woman from Finsbury Park, London, was arrested on suspicion of assault and remains in custody as inquiries continue.
A spokesman for Matt's BBQ said: "It is our understanding that there was a Road Traffic Collision (RTC) beyond the footprint of the event.
"Following this RTC, there was an altercation between occupants of the cars involved that led to an allegation of an assault.
"It is understood the Police detained a suspect shortly after. We are not aware of any incident taking place within the event".
A motorist caught up in the chaos said: “I think the late crowd were arriving as it was about 9.30pm.
"Traffic just ground to a halt to the point I assumed there had been a crash. Cars were turning around but after a few minutes we started moving again.
“It looked like a good night out to be fair but there were a bunch of people just walking down the middle of the road.
“Cars were also parked literally everywhere which was a bit mad. The entire roundabout was covered in parked cars and it was a bit of a nightmare.”
A police spokesman confirmed that police also attended the "pre-arranged and authorised music event" in the afternoon to "assist with traffic management".