Rosemary Lane off Monks Road was sealed by officers on Sunday during investigations
Lincolnshire Police arrested five men on suspicion of grievous bodily harm after an assault in Lincoln on Sunday, September 23.
Officers were called to Rosemary Lane off Monks Road in Lincoln at around 3.30am after reports that a 19-year-old man from the Leeds area had been assaulted and had a head injury.
The man is currently being treated at Lincoln County Hospital for a suspected broken jaw.
A 25-year-old man, a 24-year-old man, a 26-year-old man, an 18-year-old man and a 23-year-old man, all from the Cleveland area, were arrested on suspicion of GBH.
They have been released on police bail pending further enquiries until November 28.
Anyone in the area at the time is asked to call Lincolnshire Police with information on 101, or call independent charity Crimestoppers anonymously on 0800 555 111.