400.000 pro-democracy demonstrators have marched through the streets of Hong Kong as the former British colony marked 15 years since the return to Chinese rule.Earlier, China's visiting President Hu Jintao swore in businessman CY Leung as the territory's new leader.During the ceremony, a lone heckler tried to interrupt Mr Hu's speech.On the streets outside, massive crowds beat drums and waved flags as they marched though the city to call for full democracy and express their frustration with the mainland.A broad cross-section of Hong Kong society gathered to agitate against one-party rule in China and to demand the right to universal suffrage, which people here increasingly believe is their natural birthright.

One of the main complaints was that the system used to choose Hong Kong's leader is designed to install Beijing's choice.A so-called electoral college of 1,200 business leaders and other influential citizens, mostly loyal to Beijing, selects the leader.
People are unhappy with record property prices, an increasing wealth gap, a lack of democracy and a string of political scandals.