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Chinese authorities have detained a man who injured 22 children in a knife attack at a primary school in Henan province, authorities told state news. Two children are in critical condition and one adult was also injured in the attack, which happened at the entrance of the school. Security at China's schools has been heightened in recent years, following a deluge of similar knife attacks in 2010 that left nearly 20 children dead. The 39-year-old male suspect was arrested on the scene and is believed to be mentally ill.