A woman who was arrested on suspicion of manslaughter following the deaths of three care home residents has been released without charge.
The 60-year-old was questioned by detectives after two men - aged 74 and 91- and an 86-year-old woman were found dead at Gainsborough Care Home in Swanage on 23 October.
Dorset Police, who previously said carbon monoxide poisoning was a possible cause, said the deaths were still being treated as "unexplained".
Detectives said it could take months to establish how the residents died, while they awaited the results of "detailed forensic submissions and analysis".