Detectives are investigating after a man was left with serious injuries to his face and back after he was assaulted by a group of men in Mansfield.
It happened at around 3.10am on Sunday, September, 16, near to the bus station in Quaker Way.
The 19-year-old man is now being treated at the Queen's Medical Centre.
A police spokesman said: "It's believed another man was assaulted by the same group shortly beforehand but got away with minor injuries.
"If you saw anything or have any information that could help, please call us on 101 quoting incident 183 of 16 September. You can also call Crimestoppers anonymously on 0800 555 111."