A post-mortem carried out on Sunday was inconclusive.
Three men and two women arrested in connection with the death of a woman in Nuneaton have been bailed.
Officers were called to a property in Bucks Hill shortly after 1 am on Saturday (13 August) following a report of a disturbance.
Emergency services also attended the scene and a woman – believed to be in her 40s – was found deceased inside.
A post-mortem carried out on Sunday was inconclusive.
Detective Superintendent Caroline Corfield said: “An investigation has begun and we are working to establish the circumstances of the woman’s death, which is unexplained at this time.
“We are currently exploring a number of lines of enquiry as we attempt to build a picture of what has happened."
A 34-year-old man from Nuneaton, a 32-year-old man of no fixed abode, a 40-year-old man from Nuneaton, a 43-year-old woman from Nuneaton and a 36-year-old woman from Nuneaton were previously arrested on suspicion of murder and have now been released on bail until next month while enquiries continue.
Detective Superintendent Caroline Corfield said: “We would ask anyone who witnessed any suspicious activity in the area over Friday night (12 August) and until about 1.15 am on Saturday (13 August) to please come forward.
“Equally, if anyone has any concerns or information that can help, we would advise them to approach and speak with one of our officers.
“There will be an increased policing presence in the area, and I would like to reassure the community that we are conducting a thorough investigation.
"Our thoughts are very much with the woman’s family and friends at this difficult time.”
Anyone with information relating to this incident should call 101 quoting incident number 41 of 13 August.
Alternatively, information can be provided anonymously to the independent charity Crimestoppers via their website or by calling 0800 555 111.
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