The fires were started in a camping area of the site at Bramham Park.
Tents were set on fire and bottles and rocks were hurled as trouble flared on the final day of the Leeds Festival.
He said initially there had only been a "few fires" but within 10 minutes "more fires started popping up and the crowds got busier". The teenager, from Wetherby, added: "There were people going round with fire extinguishers, but straight away there would just be another fire lit.He said "explosions" were going on until about 10:00 BST on Monday.Plumes of smoke could be seen from areas near the festival in Wetherby
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