Bailiwick of Guernsey officials sent messages of support to Jersey after the incident, which happened in St Helier at about 4am on Saturday.
The Jersey authorities have moved the search operation to a recovery operation.
The cause of the incident is being investigated, with suspicions that it was a gas explosion.
Gas supplier Island Energy is co-operating with the investigation.
As the incident unfolded on Saturday, Guernsey’s ambulance service was on standby over the weekend to help in Jersey if needed. They were stood down yesterday.
Guernsey’s Government House has put out a message of support.
‘Deeply saddened by explosion and loss of life in St Helier,’ the Lt-Governor’s office posted on social media.
‘Sincere condolences on behalf of Bailiwick of Guernsey and all best wishes to our fellow islanders in Jersey. You are in our thoughts and prayers in this very sad week.’
Policy & Resources president Deputy Peter Ferbrache issued a statement on behalf of Guernsey.
‘On behalf of islanders I want to say how deeply sorry we are for all those affected by the devastating explosion in Jersey this morning,’ he said. ‘We have contacted colleagues in Jersey to offer our support. We are here to help in any practical way we can. Our thoughts are also with all the emergency services responding to this tragic incident.’
States of Alderney president William Tate sent his island’s condolences.
‘No words can adequately describe the profound sense of shock and sadness felt by the people of Alderney upon hearing of the tragedy unfolding on your island,’ he said.
‘Our thoughts and prayers are with the families of all those affected by this terrible explosion. Having already suffered the loss of members of your community this week at sea, we can only imagine the scale of the hurt felt by our island cousins. Please accept our deepest condolences at this most painful time.’
Herm also put out a message of support on social media.
‘Herm islanders wish to extend our very deepest sympathies to our dear sister Channel Island of Jersey and those who have been affected by the two terrible recent tragedies. Our thoughts are with you, and all the dedicated emergency services teams.’
Local churches prayed for those impacted by two tragedies in Jersey this week, including the loss of a fishing boat.
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