Chinese President Hu Jintao attends a gathering marking the 15th anniversary of Hong Kong's return to China and the swearing-in ceremony of the fourth-term government of the Hong Kong Special Administrative Region (HKSAR) in Hong Kong, south China, July 1, 2012. (Xinhua/Lui Siu Wai) 

HONG KONG -- President Hu Jintao arrived at the Hong Kong Convention and Exhibition Center Sunday morning to attend a gathering marking the 15th anniversary of Hong Kong's return to China and the swearing-in ceremony of the fourth-term government of the Hong Kong Special Administrative Region.