The investigators were probing the likelihood of ammonia leak as a cause of yesterday's fire at the Jilin Baoyuanfeng Poultry Company's plant in Mishazi Township of Dehui City, Jilin Province.
The massive fire killed 120 people and injured 77 others with survivors saying the firefighters arrived too late when the factory had been gutted.
Angry relatives of the victims surrounded police cars, accusing officers of ineffective rescue efforts and demanded an explanation for the disaster, the Southern Metropolis Daily reported.
Those who are suspected of being responsible for the accident have been taken into police custody for further inquiry.
"The fire was so quick and intense it was very difficult to escape," said Chen Hengwu, a worker at the factory who escaped unhurt, was quoted by state-run China Daily as saying.
Chen said he heard someone shout "run" at about 6:10 am (local time), several minutes after he arrived at the factory's No 2 workshop, and he saw fire spreading out of the window at the other end of the workshop.
The fire department of Jilin province said the blaze was caused by a leak of liquid ammonia, which is kept pressurised as part of the cooling system in meat processing plants.
Those suspected of being responsible for the accident have been detained, according to the local government.
Chen said there are two doors for the workshop, and normally only one door is open during working hours.
"I was only about 6 metres away from the door, so I could rush out very quickly," he said.
"When the firefighters arrived it was too late," Chen said. "The fire was almost out then.
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