(AGI) Hong Kong, July 2 - Five hundred people were arrested ata sit-in overnight in Hong Kong after a mass protest in supportof universal suffrage. More than 500,000 people joined theprotest in the former British colony which was returned toChina in 1997. The region is now administered under the formulaof "one country, two systems". Beijing is still controlled by asingle party, but Hong Kong has been promised universalsuffrage. . .