When 15-year-old Kristy Bamu left his parents in Paris on 16 December 2010, he was looking forward to spending the Christmas holidays with his siblings, visiting their sister and her boyfriend in London.

On Christmas Day he was found by paramedics in the bathroom of an east London high-rise flat. His body had been mutilated, teeth were missing and he was covered in deep cuts and bruising. In the last four days of his life he had suffered acts of unspeakable savagery, doled out by a man he called "uncle" and one of his own sisters.

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