A spokesman for China's Hong Kong and Macau affairs office said that Beijing "firmly opposes all illegal activities that could undermine rule of law and jeopardise 'social tranquillity' and it offers its strong backing" to the Hong Kong government, Xinhua news agency reports.
However, analysts say Communist Party leaders in Beijing are worried that calls for democracy could spread to cities on the mainland.
Britain handed Hong Kong back to China in 1997 under a "one country, two systems" formula that guarantees liberties not seen on the mainland, including freedom of speech and the right to protest.
至于结局会如何,看看外汇交易市场是怎么预测的:
The Hong Kong dollar HKD=, which is closely pegged to the U.S. dollar, slipped 0.1 percent to 7.761 against the greenback, its lowest level since March.