Investigators were trying to determine the cause of yesterday's fire at the factory in Tangerang, near the Indonesian capital of Jakarta, and said they didn't want to speculate before the investigation is completed.
Safety laws are inconsistently enforced or even completely ignored in Indonesia, a poor and sprawling archipelago nation where worker rights are often treated as a lower priority than economic growth and jobs.
"We are now intensively questioning witnesses including the factory owner and manager," said Tangerang police chief Harry Kurniawan.
As investigators tried to piece together what happened, relatives crushed by grief went to a police hospital's morgue in eastern Jakarta this morning to identify loved ones.
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Officials said bodies were found piled at the rear of the factory and were burned beyond recognition.
"The condition of the corpses was hard to recognize," said Umar Shahab, who heads the medical and health division of the Jakarta police. "They can only be identified through DNA and dental data."
Witnesses heard a huge explosion about 10 AM yesterday, followed by smaller blasts as orange flames jumped from the building and columns of black smoke billowed across a nearby residential neighborhood.
Survivor Ahmad Safri said the workers had poor working conditions in a hot warehouse with noisy engines, but he denied the building was locked when the fire spread.
"Many panicking workers ran in the wrong direction ... maybe to a generator room that was locked," Safri said.
He said some workers were young women and teenagers, but he was not sure if any were underage.
"Last night we met one, a woman who was alive and visiting her friends at hospital. She came to the factory but left for home because she was sick, just before the fire happened," he said.
Some 46 injured people are being treated at three hospitals.
The death toll could rise as many of those who escaped suffered extensive burns, according to police.