China says, it will not allow anyone to use Hong Kong as a base for subversion against mainland China or to damage its political stability. <br/><br/>In an interview with state television broadcast yesterday, Zhang Xiaoming, the head of China's Liaison Office in Hong Kong, said nobody is permitted do anything in any form that damages the country's sovereignty and security. <br/><br/>He said that nobody is allowed to challenge Beijing's authority or that of Hong Kong's Basic Law. Chinese leaders are increasingly concerned about a fledgling independence movement in Hong Kong, which returned to mainland rule in 1997 with a promise of autonomy known as "one country, two systems", and recent protests in the city. The former British colony returned to China under the "one country, two systems" agreement that ensured its freedoms and wide-ranging autonomy, including a separate legal system.