The inferno was reported around 6.15 pm (local time) yesterday from the house in Xinjian village, prompting authorities to rush fire tenders to the spot.
The fire was extinguished around 9 pm (local time), the state-run Xinhua news agency reported.
Nineteen people were killed and eight others were injured in the fire, it said.
The injured were taken to hospital for treatment.
According to local authorities, the city will set up a team to investigate the accident. The suspects are under police control, the report said.
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