The Xuzhou city government in Jiangsu province said the blast at the Chuangxin Kindergarten in Fengxian, which struck at 4:50 p.m. Thursday, was under investigation.
It wasn't immediately clear whether the explosion was deliberately set or the result of an accident.
Videos purportedly from the scene and posted on social media showed children and adults lying on the ground, some bleeding. Clothing, shoes and other items were strewn on the ground beside pools of blood.
Kindergartens in China have been targeted before in apparent revenge attacks
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