Police are investigating the alleged rape of a 15-year-old girl from Coventry during a school trip to Alton Towers theme park.
The girl argued with friends, walked off by herself and was approached by six youths who took her to a secluded area, Staffordshire Police said.
The teenage assailants are believed to be from another school.
An Alton Towers spokesman said a girl was treated for the effects of alcohol but she reported no other injury.
The girl has told police she suffered a panic attack after the alleged incident on 8 July.
DC Steve Kirkham, from Newcastle CID, said: "There were approximately 24,000 people at the theme park that day, many who would have travelled from all over the country.
"We are appealing to anyone who may have seen the girl, who is described as very petite with mid-brown coloured hair, or saw the youths, to contact us."
One of the offenders has been described as white, with a pale complexion and skinny build and wearing a blue t-shirt.
A second offender was slightly smaller in height, dark skinned and wearing a white t-shirt and track-suit bottoms, police said.
The other four offenders were wearing track-suit bottoms and baseball caps.
A spokesman for Alton Towers said: "This matter was brought to the attention of police and the park over a week later and there was no report made on the day to either Alton Towers security department or medical team.
"A girl was treated for the after effects of drinking alcohol on that day, but no other injury was reported by her, or observed by our medical staff at the time."