At least three people were confirmed killed in the blast early Saturday in the Channel island’s port capital Saint Helier, following a suspected gas leak.

However, nine residents remained unaccounted for, and there may have been visitors staying in the block overnight, the BBC reported.

“It is with sadness that I am confirming that the search and rescue operation has been moved to a recovery operation,” Jersey police chief Robin Smith said.

Aided by sniffer dogs and experts from southern England, Jersey emergency workers had searched the rubble overnight.

Like many others in Saint Helier, Jersey’s chief minister Kristina Moore said she was awoken by the blast.

“Across the island, you could hear this extraordinary sound,” she told the BBC.

“It’s unthinkable news. We’re all absolutely devastated and really concerned for the people who are involved, for those whose lives have been lost.”

Jersey’s gas supplier, Island Energy, said it was working with the fire service to understand what happened.

The incident caps a tragic week for Jersey, a British Crown dependency not part of the UK, whose economy relies on banking, tourism, and fishing.

The coastguard Friday abandoned a search for three Jersey fishermen missing for nearly 36 hours after their wooden boat hit a cargo ship and sank.

The freighter is owned by Condor Ferries, whose Jersey offices lie near the destroyed apartment block.

“We must call on the collective strength of the island community,” Moore said.