At least eight people died while 65 more were injured, including children, in an explosion in the Chuangxin kindergarten in Fengxian, China at about 4:50 PM yesterday, June 15.

“The police and related departments rushed to the scene as soon as it was reported and conducted rescue and investigation work on the site,” the police said on Weibo. “Currently, the investigation work is still underway.”

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According to the police, the cause of the explosion is still unknown but police were treating it as a criminal case and have targeted a suspect, according to Xinhua.

Meanwhile, videos allegedly taken 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. The videos also showed ambulances and medics attending to people to bring into an emergency room.

Schools have been targeted by attacks in the past, but officials made no suggestion that the explosion on Thursday was deliberate and asked people to wait for the results of a full investigation.

This year, China’s Premier Li Keqiang addressed concerns about school safety, promising the government would improve it.

“Campus safety concerns the healthy development of millions of students and the happiness of their families,” Li said at a meeting in April of the State Council, China’s government cabinet.