Nottinghamshire Police have released CCTV pictures of a number of men they want to speak to.
The appeal comes after an assault in Nottingham city centre on Friday, March 8.
The assault happened in Clumber Street in the early hours of the morning.
A spokesman for Nottinghamshire Police said: "We are looking to speak to the men pictured in connection with an assault in Clumber Street in the early hours of Friday 8 March. We believe they may have information that can help our investigation.
"If you recognise these men, or have any information, please call 101 quoting incident 55 of 8 March 2019."
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