A woman was subjected to a serious sex attack in a Mid Sussex roadside restaurant.
Haywards Heath detectives are trying to piece together the sequence of events at the Little Chef on the A23 in Handcross.
Detective Inspector Andy Young said: "This is a frightening and disturbing assault. The incident has been traumatic for the victim."
Mr Young appealed for anyone in or near the Little Chef between 6.30pm and 7.30pm on Tuesday to come forward.
He said police were especially interested in information about four white men in their late teens to early 20s who spoke with Liverpudlian accents.
He said police were trying to find out who the men were and what kind of vehicle they may have used.
Anyone with information should call DI Young at Haywards Heath police on 0845 6070999.
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