The cause of the fire, which injured six people, was unclear, Xinhua said. Authorities had taken 12 people into custody and were searching for another three, the news agency said, adding that rescue efforts were ongoing.

Underscoring the gravity of the incident, Chinese President Xi Jinping urged officials to "identify the cause of the accident and pursue culpability in accordance with the law", Xinhua said.

Xi called on all regions and departments to "resolutely prevent and curb all kinds of accidents from happening".
A fire at a warehouse in Guangdong province killed at least 17 people in February, and a blaze at a poultry slaughterhouse in the northeastern province of Jilin in 2013 killed 120 people.

One in four Chinese will be older than 60 by 2030, according to the Ministry of Civil Affairs.

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