A CCTV image was released after reports of a woman being sexually touched by a man at a Liverpool nightclub at a New Year's Eve party.
Officers attended at Level nightclub on Fleet Street in Liverpool city centre at around 5.10am on Saturday, January 1.
A woman in her 20s complained she had been assaulted by an unknown man. He is believed to have left the club a short time later.
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An area search was carried out but the man was not found.
An investigation is underway and CCTV and witness enquiries are being carried out.
Officers have issued CCTV image of a man who they believe could help with the investigation.
Anyone who recognises the man or has any information is asked to DM @MerPolCC or call @CrimestoppersUK anonymously on 0800 555 111 quoting reference 22000002207.
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