Alameda County Deputy Sheriff Tya Modeste said 11 of the 36 bodies recovered so far at the site in Oakland have been positively identified. Previously, the toll had stood at 33.
"We're no closer to finding a cause and we absolutely believe that the number of fire fatalities will increase," Fire Chief Teresa Deloach Reed said.
The fire erupted Friday night in a warehouse known as the Oakland Ghost Ship as a rave attended by between 50 and 100 people was under way.
Reed said firefighters have reached an area in the back of the building where they believe the fire originated.
The area was cordoned off and work was suspended there late yesterday so that federal investigators from the Bureau of Alcohol, Tobacco, Firearms and Explosives could gain access.
But all recovery work was halted shortly after midnight after crews noticed that a parapet atop the building's front exterior wall was leaning in.
"For us firefighters working under a wobbly, potentially collapsing exterior wall is extremely dangerous," said Reed. "We will not put our firefighters in danger at this point."
Survivors spoke yesterday of the speed with which Friday night's fire spread through the warehouse.
Photographer Chris Nechodom, who was at the dance party, said people first thought the smoke was coming from a fog machine.
"And then it got a little thicker," he said. "It all happened within seconds. We started seeing people running around, frantic and screaming 'fire.'"
In a macabre indication of what the fire may have done to the bodies, authorities are asking relatives to preserve hairbrushes and toothbrushes to assist in matching DNA samples.
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