Two persons died at the scene, and another six died later in hospital.
Components of a homemade explosive device were discovered in his rented property, on the walls of which were written several Chinese characters, including si - "die" - and mie - "destroy".
The blast was apparently so powerful that several people were seen thrown several metres into the air by the force of the explosion, Global Times reports.
Investigators said the blast was caused by a homemade bomb and that the main suspect was a 22-year-old Xuzhou resident who lived and worked near the kindergarten.
Xinhua said that children were leaving school when the blast occurred.
The official Xinhua News Agency said Friday that police have identified a suspect in the explosion.
The blast struck at 4.50pm on Thursday at Chuangxin Kindergarten in Feng County, Xuzhou as parents were waiting for their children to finish school.
State news agency Xinhua reported that police had made a preliminary judgement that the blast was a "criminal offence", and they had identified a suspect.
Witnesses told local media the explosion happened at a stall where hawkers were selling deep-fried snacks, and may have been caused by the mishandling of gas canisters.
The videos showed ambulances arriving, medics wheeling people into a casualty unit and medical staff treating what appeared to be a child.
Local reports state that at least eight people have died from the explosion. Officials said the bus driver, angry at losing overtime wages, had set the fire.
The shop owner said his daughter also attended the school yesterday and was later taken home safely by her grandfather.
China in the past witnessed knife attacks on kindergarten school children by disgruntled people.
It was revealed Friday that no teachers or children were among the dead or the wounded.
But with China maintaining strict control on firearms, most of the other attacks have involved knives or other sharp implements, such as last year's attack on an elementary school in northern China that left seven children wounded.
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