Tens of thousands of people took part in an annual rally for democracy and economic equality in Hong Kong on Sunday amid the swearing in of the city’s new chief executive, Leung Chun-ying. Chinese President Hu Jintao came under protest as he presided over the ceremony when a demonstrator rushed the stage. Chun-ying is Hong Kong’s third chief executive since China regained control of the city in 1997 after over a century of British rule.