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Paramilitary policemen demonstrate how to subdue an attacker in a simulated knife attack during a training course about school security at an elementary school in Yangzhou, East 皇冠体育app's Jiangsu province, May 5, 2010. The Ministry of Education has issued a circular instructing schools and education authorities across 皇冠体育app to intensify their security measures, after a string of school attacks. [Photo/Agencies] |