Communications to the Shetland Islands, UK, have been severely disrupted after a subsea cable was "damaged."
Police have declared a major incident after the south subsea cable between the islands and the mainland was cut.
The force said some landlines and mobiles were not usable and that officers were patrolling to try to reassure residents.
Repairs to another cable connecting Shetland and Faroe are ongoing after it was damaged last week.
First Minister Nicola Sturgeon said it was an emergency situation for the island.
The Scottish government's resilience committee had met and was working with partner agencies to ensure support was provided, she added.
She said the assumption was the damage was accidental, adding: "There is nothing to suggest otherwise, but work is continuing to assess exactly what the cause of the problem has been."
MP for Orkney and Shetlands Alastair Carmichael told the BBC he had raised the issue with the UK government, but understood it could be days before communications were restored.
He said the priority was fixing the issue but that resilience would also need to be looked at in future.