Detectives investigating a serious assault at a house in Ripley are appealing to anyone who saw suspicious activity in the area to come forward.
Police were called to an address on Rowan Avenue, Ripley, at 11.20pm on Thursday, May 16, following reports of an assault inside a home there.
A 32-year-old man and a 25-year-old woman required hospital treatment as a result of injuries they suffered during the assault.
A second woman, aged 32, suffered minor injuries and was not taken to hospital.
Officers would like to speak to anyone who was in the area around the time of the incident and saw any suspicious behaviour or vehicles.
Four men, aged 36, 38, 50 and 21-years-old, have been arrested on suspicion of the assault and have been released on bail pending further inquiries.
Anyone with information about the incident is asked to contact Amber Valley CID on 101, or call Crimestoppers anonymously on 0800 555 111.