A man was taken to hospital with serious injuries, and four people were arrested after a fight in Grantham.
Officers were called to Medway Avenue to report of a large disturbance in the street during the evening of Friday, June 26.
Two men, aged 50 and 33, and two women, aged 49 and 33, from the area were arrested for a public order offence of causing an affray at around 8.30pm.
They have since been released on bail.
Lincolnshire Police are appealing for anyone who witnessed the incident, or is in possession of any CCTV, dashcam or mobile phone footage, to contact them.
Anyone with information should contact police on 101 or via email at [email protected] quoting incident 457 of June 26.
Alternatively, it can also be reported through the independent charity Crimestoppers anonymously on 0800 555 111 or online here.