Hong Kong police fired tear gas at protesters on Sunday as thousands gathered outside a police station in Sham Shui Po to defy a police ban on marches.
This comes after leader Carrie Lam warned she would grant no concessions to the demonstrators.
Thousands of activists also occupied the airport arrivals hall for a third day, while others gathered at city parks.
The protest movement, which began in response to a controversial extradition law, has gained momentum over the last three months.

Netanyahu set to remain caretaker after inconclusive Israeli election
At least 68 people killed in Spain after two high-speed trains collide
Syria says main border crossing with Jordan to resume operations on Wednesday
Policeman kills knife attacker outside Israeli embassy in Serbia
Three killed, thousands evacuated as Cyclone Arnab hits eastern India