GUANGZHOU - The children of migrant workers, who reunite with their parents during the summer holidays, are at risk of being injured or killed in accidents.

Migrant workers' children were involved in 90 percent of the accidents involving children in Guangdong's Zhongshan city during the summer, said Li Liang, an official with the city's education bureau, speaking to Zhongshan Commercial Daily.

In one case, 3-year-old Cao Jun, who came from Jiangxi province to join his parents in Foshan, died when he fell into a hole at a construction site on Aug 8. His parents were nearby buying him bread.