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Liu Xiaohui was arrested at 10:50pm on Wednesday, about 12 hours after the morning attack, the Anfu county police said in a statement. He had fled and gone into hiding, the statement said.
Police did not provide any information on the identity and ages of the victims.
China's Global Times newspaper reported that at least one victim was a child and that the attacker is believed to have been armed with a knife.
China upgraded security at schools following a spate of of deadly attacks in recent years attributed largely to people bearing grudges against society or with mental illnesses.
China does not allow private gun ownership, so most such attacks are carried out with knives, homemade explosives or gasoline bombs.
Around 100 children and adults have been killed and hundreds injured over the past decade in apparently uncoordinated "lone wolf" attacks in which the motive was unclear. The mostly male assailants were either killed, ended their lives or were put on trial and executed.
Acts of violence against China's youth resonate especially strongly due to the country's chronically low birth rate, partly due to decades of population control policies.Associated Press
Two other people were injured, the local government in part of Anyang city said in a statement on Tuesday. The fire was reported about 4:30pm on Monday and took firefighters about 3 1/2 hours to bring under control, the Wenfang district government said.
Rhonda Blackmore, the Assistant Commissioner of the RCMP Saskatchewan, said some of the victims appear to have been targeted by the suspects but others appear to have been attacked at random. She couldn't provide a motive.
Earthquakes are common in the southwestern province of Sichuan, especially in its mountains in the west, a tectonically active area along the eastern boundary of the Qinghai-Tibetan plateau.
The accident took place in the early hours of Sunday morning in Sandu county, around 170 km (105 miles) southeast of the provincial capital, Guiyang, police said. The bus was carrying 47 people and the 20 injured were being treated on Sunday, police added.
Featuring more than 200 distinguished local and international calligraphers and artists, the Biennale seeks to underscore the significance of calligraphy as a powerful medium for cultural expression.
Last month, the government in Sindh introduced a bill that would imprison parents for up to one month if they fail to get their children immunised against polio or eight other common diseases.
Sharjah Police arrested an Arab national who deceived women by promoting home massage services in return for cheap prices through a social media platform, for the purpose of blackmail and threats to obtain money.