Hong Kong International Airport has cancelled departing flights, as anti-government protests in its main terminal continue for a fourth day.
Thousands are gathered at the airport - which is one of the world's busiest.
In a statement, officials said operations had been "seriously disrupted" by the public assembly.
Many of those protesting are critical of the actions of police, who on Sunday were caught on film firing tear gas and non-lethal ammunition at close range.
Some protesters are wearing bandages over their eyes in response to images of a woman bleeding heavily from her eye on Sunday, having reportedly been shot by a police projectile.
In a statement on Monday, Hong Kong's Airport Authority said they were cancelling all flights that were not yet checked in.
They advised members of the public not to travel to the airport but said arrivals already heading into Hong Kong would be allowed to land.
About 75 million passengers passed through the airport - which is a major international transit hub - in 2018.
Hong Kong's mass demonstrations and unrest show no sign of abating, more than two months after they were sparked by a controversial extradition bill.
What happened on Sunday?
On Sunday afternoon, a peaceful rally in the city's Victoria Park led to clashes when protesters moved out of the area and marched along a major road despite a police ban.
There were confrontations in several central districts and police used non-lethal bullets in an attempt to disperse the demonstrators.
In the bustling central Wan Chai district, petrol bombs and bricks were thrown at police, who responded by charging at protesters.
A number of people, including a police officer, were injured in the clashes.
Videos on social media also showed officers storming enclosed railway stations and firing tear gas.
Footage inside another station showed officers firing what appeared to be non-lethal ammunition at close range and several police officers beating people with batons.
While protests in the city have turned increasingly violent, there were no reports of arrests during the three previous days of the airport sit-in.
BBC
BDST: 1540 HRS, AUG 12, 2019
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