Police are questioning passengers on a North Sea ferry to establish how a fire started which led to an emergency rescue.
Six people had to be winched off the ship after they breathed in smoke. One passenger suspected of starting the fire in a cabin room has been detained on board.
Northumbria Police are now believed to be dealing with the incident.
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A post-mortem examination 'has not identified any injuries to suggest any other person was involved', Dorset police said.