The bodies of a man and a woman have been found in a first-floor flat in Gorleston-on-Sea, Norfolk, at about 19:30 BST on Tuesday.
Officers forced their way inside and discovered both of the bodies in one room. It is not thought others are being sought in connection with the incident.
The man and woman were pronounced dead at the scene. Norfolk Police said their deaths were being treated as unexplained.
A police presence remains at the property as the investigation continues and flowers have been laid outside.
The force said officers attended after it received a report of concern for the safety of a person at the property.
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