The 31-year-old man from London and a 14-year-old boy from Surrey were arrested in connection with the incident on Friday, and have been bailed until October 6. They were not allowed to return to the Reading Festival site for the rest of the weekend.
The alleged incident took place on Thursday night at around 11.30pm and the 19-year-old victim told police she was attacked in one of the caravans at the festival traders site.
Anyone with information should call 101 or Crimestoppers anonymously on 0800 555 111.
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