At least one child was killed in a “stampede” at a primary school in northern China and 20 others injured, according to Chinese media reports. The incident happened at the Third Experimental Primary School in Puyang county in Henan province on Wednesday morning, The Beijing News reported. Two children were killed, the newspaper said. The state-run Xinhua news agency reported that one child had died. A parent at the school said on social media that the stampede occurred after panic broke out when a toilet wall collapsed. The authorities said they were still investigating the cause of the incident. Strict crowd limits set for Beijing Lunar New Year celebrations in wake of Shanghai crush One pupil died on the way to hospital, while another passed away after they arrived at the medical centre. Two other children were critically injured, the newspaper report said. Similar deadly incidents have happened in China before. Six children died and 26 were injured after they were trampled in a panic on a staircase at a primary school in southwestern Yunnan province three years ago.