Beijing ? China has ordered tougher inspections of private preschools and kindergartens after the deaths of three toddlers who were left on school buses for up to seven hours, state media reported on Friday.

In the latest case, 2-year-old Qiu Chenyang died Monday after he was left on a bus for seven hours in Dongguan, a city in southern Guangdong province, the official Xinhua news agency said.

A 20-month old child died Aug. 20 in Guangdong’s Foshan city after being left on a school bus for six hours, the report said. On May 29, a 3-year-old in central Anhui province was found dead after being left on a bus for six hours.