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.

Trump not satisfied with Iran's latest proposal, will not 'leave war early'
Iran sends proposal for negotiations with US to mediator Pakistan
Iran threatens painful response if US renews attacks
US Navy acting 'like pirates' to carry out naval blockade of Iranian ports, says Trump
Germany urges stronger European defence after US reduces troops