The focus on the airport comes as the city's protest movement enters its 11th week.
While Chief Secretary Carrie Lam has suspended the bill, protesters are demanding that the legislation be completely withdrawn and that Lam resigns.
Police have arrested more than 600 people since the unrest began more than two months ago.
In the meantime, personal information of some police officers flying with the airline had been maliciously leaked.
In a separate incident, protesters gathered outside a police station in Sham Shui Po and stood their ground as they were surrounded by officers wearing protective gear who looked down at them from a tall wall.
According to hospital authorities, 13 people were injured and taken to hospital on August 11, with two people in serious condition, local media reported. Nine had been discharged, but a man and woman were still in serious condition.
"This wantonly tramples on Hong Kong's rule of law and social order", he said at a press briefing in Beijing. A spokesman declared that there was "no longer any fixed period of time or fixed locations for these persistent and large-scale illegal and violent acts".
One female protester was seen being treated by paramedics, after she was hit in the face by a beanbag round.
At the airport over the weekend, leaflets in Chinese, English, French, Korean, Japanese and other languages were handed out to arriving worldwide visitors, explaining the causes of the unrest - as protesters see it - and the demands of the opposition movement.
Yang, who delivered the televised address in which he backed police handling of the protests, said that those who care about the city should come out against the violence.
The bill has been suspended, but protesters have stepped up their demands and are now calling for greater democracy and Lam's resignation.
Shares in Hong Kong's flagship carrier Cathay Pacific plunged more than four percent on Monday, after Beijing banned airline staff supporting Hong Kong protesters from flights going through the mainland. The reports declared that the photo was evidence of a U.S. "black hand" in the protest seeking to foment a "colour revolution" in Hong Kong.
She told reporters: "The UK has no sovereignty, jurisdiction or right of supervision over Hong Kong".
Scantlebury and her brother, Julian, grew up in Hong Kong but study in the United Kingdom and Australia, respectively.
The move also signalled China is warning Hong Kong businesses and their workers to stay out of politics. Nevertheless, the response of the Trump administration and the American media to the Hong Kong protests has been relatively low key, unlike the strident propaganda that has been associated with US-driven "colour revolutions" in the past. The US has been confronting widespread opposition of its own in the US territory of Puerto Rico.
Hong Kong was guaranteed freedoms not granted in mainland China, including an independent judiciary, under a "one country, two systems" formula, when Britain handed it back to China in 1997.
Other demonstrators blocked roads in Wan Chai, where police headquarters is located, and the Causeway Bay shopping district, chanting "reclaim Hong Kong, revolution of our times".
The airline also confirmed that two staff members had been sacked for misconducts.
Consequently, Cathay Pacific CEO Rupert Hogg wrote in a memo to employees that the company is legally required to comply with China's aviation authority. One of the most high-profile brands in Hong Kong, Cathay became a visible target for Beijing last week after many of its employees took part in a general strike that resulted in the cancellation of hundreds of flights.
Hong Kong's global airport has ground to a halt Monday as thousands of protesters swarmed its main terminal to express their outrage over another night of violent clashes between pro-democracy activists and riot police.