Protests have continued at Hong Kong International Airport, causing flight check-in services to be suspended.
Tuesday's action was called to back demands for an extradition bill that would allow suspects in Hong Kong to be sent to mainland China to be scrapped completely, as well as to protest the police's handling of demonstrators.
A large number of young people gathered at the airport in the afternoon.
In the departure lobby, the protesters occupied areas in front of the two entrances to the security checkpoint, blocking passengers.
Airport officials say boarding procedures have been halted since 4:30 p.m. local time.
A university student said she is sorry to cause trouble, but demonstrators need the help of the international community because the government is ignoring their demands.
Operations at the airport were halted by similar protests from Monday until Tuesday morning, causing the cancellation of more than 300 flights on Tuesday.
Last week, more than 200 flights were canceled at the airport amid a general strike.
According to the Hong Kong government, the number of visitors to the territory has dropped significantly since mid-July, when protests intensified. It says the number fell by more than 30 percent between mid-July and early August compared with the same period last year.
Concern is rising that the sit-in will cause further damage to tourism, one of the territory's major industries.