A 14-year-old boy from Croydon has been arrested on suspicion of raping a woman at Reading Festival.
The boy and a 31-year-old man from London are being held in police custody after the 19-year-old was attacked in a caravan on the festival traders' site last night.
She had earlier met a man and a boy near an ice-cream van opposite a mobile phone charging point in one of the campsites, Thames Valley Police said.
The arrests emerged as festival-goers poured in to see acts this weekend including Arctic Monkeys, Blink-182 and Paramore.
Chief Inspector Dave Parker said: "There is currently a scene watch in place and I would like to reassure those attending the festival that crime levels remain low and crimes of this nature are very rare.
"Officers are patrolling the site to support on-site security and if anyone has any concerns, please feel free to approach our officers to discuss these."