Durham police say there is no threat to public safety after two people were found dead in a home in Whitby and two others were taken to the hospital.
Officers were called to the area of Fallingbrook Street and Taunton Road East for a sudden death.
When police arrived on the scene, two people, a 62-year-old woman and a 51-year-old man, were pronounced dead. Two other people were taken to a local hospital. Their ages and genders were not immediately available.
Whitby Fire Services also attended to conduct tests for environmental hazards, and the area was deemed safe.
A post-mortem exam has been conducted on both people, and the investigation is still ongoing. Investigators believe there is no threat to public safety.