Children ride on motorcycles used by ASU police officers during an open day held to celebrate the 40th anniversary of their founding in Hong Kong on Saturday, September 9, 2017.(Photo: China News Service/Tan Daming)
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Children ride on motorcycles used by ASU police officers during an open day held to celebrate the 40th anniversary of their founding in Hong Kong on Saturday, September 9, 2017.(Photo: China News Service/Tan Daming)