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Armed Hong Kong police patrol the walkways overlooking the area where Chinese President Xi Jinping is staying in Hong Kong on June 29, 2017, as he visits to mark the 20th anniversary of the handover from British to China rule. China's President Xi Xinjing arrived in Hong Kong on June 29 to mark 20 years since it was handed back to China by Britain, with leading democracy activists already in police custody after a protest in the politically divided city. / AFP PHOTO / Jayne RUSSELL (Photo credit should read JAYNE RUSSELL/AFP/Getty Images)

Armed Hong Kong police patrol the walkways overlooking the area where Chinese President Xi Jinping is staying in Hong Kong on June 29, 2017, as he visits to mark the 20th anniversary of the handover from British to China rule. China's President Xi Xinjing arrived in Hong Kong on June 29 to mark 20 years since it was handed back to China by Britain, with leading democracy activists already in police custody after a protest in the politically divided city. / AFP PHOTO / Jayne RUSSELL (Photo credit should read JAYNE RUSSELL/AFP/Getty Images)
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Armed Hong Kong police patrol the walkways overlooking the area where Chinese President Xi Jinping is staying in Hong Kong on June 29, 2017, as he visits to mark the 20th anniversary of the handover from British to China rule. China's President Xi Xinjing arrived in Hong Kong on June 29 to mark 20 years since it was handed back to China by Britain, with leading democracy activists already in police custody after a protest in the politically divided city. / AFP PHOTO / Jayne Russell (Photo credit should read JAYNE RUSSELL/AFP/Getty Images)

Armed Hong Kong police patrol the walkways overlooking the area where Chinese President Xi Jinping is staying in Hong Kong on June 29, 2017, as he visits to mark the 20th anniversary of the handover from British to China rule. China's President Xi Xinjing arrived in Hong Kong on June 29 to mark 20 years since it was handed back to China by Britain, with leading democracy activists already in police custody after a protest in the politically divided city. / AFP PHOTO / Jayne Russell (Photo credit should read JAYNE RUSSELL/AFP/Getty Images)
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An armed policeman stands guard ahead of a visit by China's President Xi Jinping in Hong Kong on June 29, 2017. China's President Xi Jinping arrives in Hong Kong on June 29 for a three-day visit to mark the 20th anniversary of the city's handover from British to Chinese rule and to inaugurate new chief executive Carrie Lam on July 1. / AFP PHOTO / DALE DE LA REY (Photo credit should read DALE DE LA REY/AFP/Getty Images)

An armed policeman stands guard ahead of a visit by China's President Xi Jinping in Hong Kong on June 29, 2017. China's President Xi Jinping arrives in Hong Kong on June 29 for a three-day visit to mark the 20th anniversary of the city's handover from British to Chinese rule and to inaugurate new chief executive Carrie Lam on July 1. / AFP PHOTO / DALE DE LA REY (Photo credit should read DALE DE LA REY/AFP/Getty Images)
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