A teenage girl was sexually assaulted at a party in Thame Leisure Centre in Oxfordshire.
The incident took place at about 0130 GMT on Sunday, but police have just released the details.
A police spokesperson said a 17-year-old was followed into the disabled toilets by a man and sexually assaulted.
The man is described as white, about 5ft 6in (1.67m) and was wearing a white polo shirt, or top and blue jeans.
He is said to be of medium build and has short mousey-coloured hair.
Det Con Kim Dugmore said: "I am keen to speak to anyone who was at the party who might have any information to help us with our investigation.
"The girl was talking to some people in the corridor before she was followed into the toilet and there were also people waiting outside who might have seen either of them leave afterwards.
"I urge anyone who might have seen the girl or man to contact me."
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