A man with a knife wounded 22 children and an adult at a primary school in central China on Friday.
The incident happened at the gate of a school in Chenpeng village in Henan province.
Xinhua news agency reported a man identified as Min Yingjun, 36, a villager, was under arrest. The agency did not give further details of the extent of the injuries.
Security at schools in China has been increased in recent years following a spate of similar incidents.
In 2010, a man slashed 28 children, two teachers and a security guard in a kindergarten in eastern China.