Demonstrators say they are fighting the erosion of the "one country, two systems" arrangement that enshrined some autonomy for Hong Kong since China took it back from Britain in 1997.
After gathering peacefully in the Central business district, they marched on the Government House residence of Hong Kong's embattled leader Carrie Lam, chanting "Hong Kong police know the law, they break the law". "We all feel tensions are building and the level of stress is increasing," one protester told Reuters during a sit-in at the international airport earlier in the week.
Thousands of mostly young protesters forced a shutdown of flights at the city's Chek Lap Kok international airport on Monday, disrupting flights until late Tuesday.
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