The China authorities on Friday said that a man who had written about death and killing was responsible for an explosion outside a kindergarten in eastern China that killed eight people and injured dozens of others, the Chinese news media reported. The explosion also wounded 65 people, eight of whom sustained serious injuries.
The blast happened outside the gates of the Chuangxin Kindergarten at 4.50pm - as relatives were reportedly collecting their children at the end of the school day.
Videos posted by the People's Daily showed a chaotic scene, with children and adults lying on the ground, some of them motionless, their clothes blown off them, and others struggling to get up.
According to reports, the blast was caused by a gas cylinder at a roadside food stall and has been identified exclusively as a criminal act without terror implications although the police have not yet revealed any potential motive of the suspect.
Two people died at the scene and six died after being taken to a hospital.
Investigators found bomb-making materials at Xu's nearby residence in the city of Xuzhou in Jiangsu province. Clothing, shoes and other items were strewn across the area beside pools of blood.
In 2010, almost 20 children were killed in attacks on schools, prompting a response from top government officials and leading many schools to beef up security by posting guards and installing gates and other barriers.
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Li Meijin, a professor in the department of criminology at the People's Public Security University of China in Beijing, said numerous attackers appear to the men in the prime of their life, who may be struggling to cope with pressure or difficulties in their lives.
Officials later said the fire was intentionally set by the driver, who was angry at losing overtime wages.
The suspect had dropped out of school owing to a neurological disorder, according to authorities.
Guns are banned in China and official data shows violent crime is relatively low in China compared to other parts of the world, with a murder rate less than fifth of that in the United States.
China maintains tight control over firearms and most attacks are carried out using knives, axes or homemade explosives.
In the year 2010, almost 20 children were killed in various attacks on schools, prompting protests and leading to many schools increasing their security and posting guards. However experts question the accuracy of the Chinese data and say many crimes go unreported.