Businesses, both worldwide and local, in Hong Kong have also faced pressure and accusations of acting in concert or sympathizing with the protesters.
Hong Kong's airport is a major regional hub, handling 1,100 passenger and cargo flights daily, with services between the city and about 200 global destinations.
Traffic on roads to the airport was extremely congested and auto park spaces were full, it said.
The rioting poses "a serious challenge to Hong Kong's prosperity and stability", Yang said.
Tang said that on August 11, some people turned a deaf ear to the police's objection and got involved in unauthorized rallies.
Violent protests gripped the city over the weekend as demonstrators destroyed barricades across the city and police fired tear gas into crowded underground train stations - the first occurance of this nature.
Eleven-year-old Janice Ly and her mother, Ping Fam, from Surrey, B.C., were scheduled to be on the only flight to Canada that was cancelled during the mass pro-democracy protests.
The 17.05 (local time) Air New Zealand flight from Hong Kong to Auckland looked to be going ahead, but the 21.05 Cathay Pacific flight to Auckland was showing as cancelled, along with Cathay Pacific, Virgin Australia and Qantas flights to various destinations in Australia.
The flight cancelations left many visitors stranded in the airport, surrounded by scores of protesters.
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Hong Kong Police Fire Tear Gas To Disperse Protesters
Heavily-armed riot police used tear gas and batons to attempt to intimidate protesters, resulting in injuries and arrests. Scantlebury and her brother, Julian, grew up in Hong Kong but study in the United Kingdom and Australia, respectively.
Police have defended themselves as accusations of using excessive force against protesters and on Monday unveiled two water cannons - a method that has not yet been used during the crisis. "The police action has gone totally nonsensical".
The vehicles are "one of our options for our use of force or special tactics", he added during the Monday presentation.
The protests, which were initially against the now suspended extradition bill that would have allowed suspects in criminal cases to be moved to mainland China for trial, now demand broader political reform and the resignation of city officials.
Riot police fire pepper spray against protesters during the anti-extradition bill protest in Hong Kong on Sunday. Last week, British Foreign Secretary Dominic Raab spoke with Hong Kong leader Carrie Lam, during which he "condemned violent acts by all sides but emphasized the right to peaceful protest, noting that hundreds of thousands of Hong Kong people had chosen this route to express their views".
They have been seen as the biggest threat to Beijing's rule since Britain handed Hong Kong over in 1997.
The airport authority said it was working with airlines to resume flights from 6:00am (local time) on Tuesday, but the developments raised the stakes sharply after a weekend of skirmishes during which both activists and police toughened their stances.
The airline has also found itself the target of a boycott call by mainland residents.
Chinese officials have also appealed to Hong Kongers directly to condemn the violent protests, in an apparent attempt to split the movement.
It said Saturday it had also fired two ground staff, without specifying why.