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Thirty-three bodies have so far been recovered from a warehouse in Oakland, California, following a deadly fire during a party, officials say, the BBC reports.
Only about 20% of the building has been searched and “a significant number” of people are still missing, they said.
It is unclear what caused the fire at the converted warehouse.
The safety record of the building is under close scrutiny. There were no sprinklers and the only exit from the second floor was a makeshift stairwell.
Oakland fire chief Teresa Deloach-Reed said between 50 and 100 people were inside the venue when the fire started late on Friday.
The old warehouse, known as the Ghost Ship, was hosting a concert by electronic group Golden Donna and six other acts.
The fire caused the roof to collapse on to the second floor, part of which then fell through to the ground floor.