A man suffered a fractured skull and a bleed on the brain after an assault on New Year's Eve.
Investigations are ongoing after the 22-year-old man was assaulted in Osberton Road area, Retford, at around 6pm on December 31.
The man was taken to hospital where he was found to have sustained a bleed to the brain.
He also suffered a potential fractured wrist, as well as cuts and bruises to his arms and face.
His condition is not thought to be life-threatening.
Police are now appealing for the public's help.
Detective Sergeant Ricky Ellis, of Nottinghamshire Police, said: “This was a nasty attack which has left a man with bleed on the brain and requiring hospital treatment.
“We are keen to talk to anyone who may have seen anything or has any information and officers are currently working hard to understand exactly what happened.
“We would urge anyone with any information or who saw anything around Osberton Road, to get in touch.
“Any information you have – no matter how insignificant it may seem to you could prove to be a vital clue in our investigation."
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