Ma Hongjiang presents watermelon to members of the special police force on Pingding Hill in Urumqi, capital of northwest China's Xinjiang Uygur Autonomous Region, July 14, 2009. The residents of various ethnic groups living on Pingding hill resumed their peaceful and harmonious life after the deadly July 5 riot, thanks to the peacekeeping police force who managed to maintain ethnic unity and social stability here by helping locals recognize the truth and publicising the ethnic policy with their sincerity. [Li Ziheng/Xinhua]