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The 30-year-old, who has a history of mental illness, was caught on surveillance camera pinning the girl against a wall as the other pupils look on. He had rushed into the playground naked before he assaulted the victim according to metro.co.uk.

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‘The suspect appears to have been suffering from mental disorders since 2011, but doctors said he would have been fine if the illness had not returned in two years,’ a police spokesman said.

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Hou has been detained. The victim will see a psychiatrist after the event. She has not reported any physical pain.