HONG KONG, July 1, 2016 (Xinhua) -- Helicopters carrying the Chinese national flag (R) and the flag of Hong Kong Special Administrative Region (HKSAR) fly over the Golden Bauhinia Square during a flag raising ceremony in Hong Kong, south China, July 1, 2016, to celebrate the 19th anniversary of the establishment of the HKSAR. (Xinhua/Lui Siu Wai)