Seven people were taken to hospital after the alarm was raised early on Wednesday morning.
The Gainsborough care home was evacuated, and other residents taken initially to a church hall before being moved to “more suitable” accommodation.
A possible carbon monoxide poisoning is the “primary line of inquiry”, according to police.
A woman has been arrested on suspicion of manslaughter after three people were found dead at a care home in Swanage.
Dorset Police said it had arrested the 60-year-old woman on Wednesday “to enable us to establish whether there have been actions or omissions which are grossly negligent and gather as much information as we can about what has happened”.
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The deaths at the Gainsborough Care Home are currently being treated as “unexplained” and possible carbon monoxide poisoning is the “primary line of inquiry”, police said in an earlier update.
Seven people were taken to hospital “as a precaution” and the property was evacuated.
The police, who were called at 7.16am on Wednesday, said there is no risk to the wider public.
