The fire broke out in a 14-storey building in a high-tech zone of the city of Zigong, shrouding the vicinity with thick smoke, according to the Xinhua news agency.
Overnight rescue work ended at 3:00 a.m. (1900 GMT on Wednesday), state broadcaster CCTV said.
Preliminary investigation showed the fire was due to construction operations. Further investigation was underway to identify the specific cause of the fire.
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