At least 10 primary school pupils have been injured in a stampede in the southwestern municipality of Chongqing , mainland media reported yesterday. The children were crushed as they raced back to their classrooms after an event on the school playground. About 800 students from Bai Sheng Township Central Primary School in Fuling district had gathered in the playground on the morning of April 23 for a speech contest and to take part in fund-raising activities, the Chongqing Economic Times said. After the event, the students swarmed back to their classrooms. At least 10 fell in crowded stairwells, it said. Six were taken to hospital. Without elaborating on the condition of the injured students, the report said the school's headmaster had been reprimanded by the local education department. Phone calls to the school went unanswered yesterday. An official from the education department of Fuling district was quoted by the newspaper as saying the department had called a meeting just 10 days before the incident, underlining the importance of taking precautions to keep children safe, including reminders on how to avoid stampedes of this nature. This was not the first time a stampede had occurred in Chongqing. French supermarket Carrefour in Shapingba district held a sale on November 10. By 4.30am a large crowd had gathered outside. When the supermarket opened at 8.30am people poured inside. Three people were killed in the stampede. The incident prompted a nationwide controversy, with some experts accusing the retail giant of neglecting customer safety. Others criticised the shoppers for their behaviour.