A kindergarten in Beijing has been sued over its synthetic running tracks, which are suspected of causing sickness among children.

The Liu Shikun Wanxiang Xintian Kindergarten, with about 500 students, was accused of refusing to demolish its synthetic tracks - which have been alleged to have caused vomiting, nosebleeds and skin reactions among the students - since they were renovated in April.

China Biodiversity Conservation and Green Development Foundation, an NGO, filed a public-interest lawsuit against the kindergarten on Tuesday.