A 50 year old man and 29 year old woman remain in Police custody on Wednesday morning.
The pair were arrested on suspicion of murder, following the discovery of the body of a 33 year old man in a property in Molesworth Road in Plymouth in the early hours of Tuesday morning.
Devon and Cornwall Police said a forensic post mortem is due to be carried out to identify the actual cause of death.
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Decontamination work is to begin at nine sites across the city.
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Taking a little while to clear but by mid-morning its sunny everywhere.