Questions whether billions spent on high-speed train network is money well spent.
No additional details were given about the attacker.
Parents rushed to the school after the attack, and the building and grounds were subsequently cleared.
Zheng Minsheng, a former doctor, was executed on Wednesday for a March 23 attack in which he killed eight children in the city of Nanping, in Fuijan, a province adjoining Guangdong.
Zheng apparently carried out the murders while he was depressed after being jilted by a girlfriend.
Many couples in China have only one child due to a law to regulate population growth.