A 45 year old man's been arrested on suspicion of murder after armed police raided a house in Seaham.
The operation was carried out by Durham police on behalf of Greater Manchester Police who are investigating the deaths of a man and a woman in their sixties, who were found dead in a house on Friday afternoon.
A post-mortem revealed both died from gunshot wounds.
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GMB's Ben Shephard is cycling, running and swimming from Whitehaven to Tynemouth to raise money for the Children's Heart Unit Fund (CHUF).
Grandfather Stewart Anderson, 54, died after an incident at Durham's Loveshack nightclub in Durham City
The events were part of the work of the Commission for Health and Social Care Integration in the North East.