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The Chinese police have "targeted" a suspect in the blast at the entrance of a kindergarten in east China's Fengzian County, as the death toll in the explosion climbed to eight, the state media reported on Friday.
One of the injured died at the hospital later, it said.
Calling it a "criminal offence", the police have "targeted" the suspect, the report said, without providing further details.
The blast occurred around 4:48 PM (local time) on Thursday. Two persons were killed on the spot, and another six died later in a hospital. The condition of eight among the injured remained critical, doctors said.
More than 10 senior doctors from Nanjing and Wuxi cities of Jiangsu have rushed to the site of the blast.
A working team led by Huang Ming, deputy minister of public security, has been sent to investigate the blast that occurred as parents were about to pick up their children from the school.
The provincial government has ordered checks of possible safety risks at the production site, the Xinhua report said.
"Many people might be dead," he said.
Another shop owner near the kindergarten, who refused to be identified, told the Post that the blast happened a few minutes before the kindergarten opened its doors to allow parents go inside the school.
"The parents were all queueing up at the school gate at the time," the shop owner said.
Many cooked food stalls operated outside the kindergarten and a gas cylinder might have caused the explosion, he said.
Officials later said the fire was intentionally set by the driver, who was angry at losing overtime wages.