A man wielding an ax attacked and killed two young girls and four adults while they were on their way to a nursery school this morning in Gongyi City, China, the BBC reports. Police have apprehended the suspected killer, a 30-year-old local farmer who they say "has a history of mental health illness." It’s the latest in a string of attacks on Chinese schools, including one last month in which eight children were hurt when an employee at a Shanghai child-care center attacked them with a knife. The attacks are unrelated, but have sparked calls for increased security around schools. (More murder stories.)