State broadcaster CCTV said 40 had been injured, three seriously, including the head of the school, another security guard and a student.
In earlier attacks, a woman wielding a knife injured 14 children at a kindergarten in the western city of Chongqing in October 2018. Almost 20 children were killed in school attacks in 2010, prompting a response from top government officials and leading many schools to add gates and security guards. Chinese law restricts the sale and possession of firearms, and mass attacks are generally carried out with knives or homemade explosives.
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