At least eight protests in various forms were planned over the weekend in the city.
Several thousand people gathered on Monday for a fourth day of anti-Hong Kong government protest. Others hurled taunts and rocks, and shone laser pointers at officers' faces until squads of riot police pushed forward, dousing the crowd with tear gas.
"We saw recently that the police's control of their emotions is extremely poor", said Lam Cheuk-ting, who accused police of having "abused their power to attack many protesters who aren't resisting".
The long-term stability of the global financial hub is crucial to China's economic well-being, and images of Chinese troops or riot police on the streets would be broadcast and live-streamed around the world.
Ng, a father of a 9-year-old girl, said that he felt "troubled to see children grow up in this kind of social environment" and urged the government to listen to the concerns of Hongkongers. 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. Chants such as "liberate Hong Kong, the revolution of our time" rang out as they filed into escalators alongside commuters and baffled tourists. "I think it's unbelievable".
In one of his posts, the former Hong Kong chief executive said those employees should be fired as they brought political issues into the work place and affected passengers with their political demands.
While both said they haven't been scared by the violence that has rocked Hong Kong in recent weeks, they admitted to being anxious about what could happen at the airport this evening.
A protester holds up a banner warning of the dangers of travelling to Hong Kong at the airport.
The government statement said: "Violent protesters vandalised public property and blocked roads".
The phrase, popularized by legendary martial artist Bruce Lee, speaks to the ability to adapt oneself to fast-changing situations.
The protests began in opposition to a bill allowing extradition to the mainland but have widened to highlight other grievances, drawing broad support.
Over the weekend police fired tear gas into subway stations.
That became a cat-and-mouse chase with demonstrators late into the summer night.
China has reportedly threatened to bar air crew who take part in protests from its air space.
Police demonstrate a water cannon equipped vehicle at the compound of the Police Tactical Unit in Hong Kong August 12, 2019.
Meanwhile, thousands packed the arrivals hall of Hong Kong International Airport for a peaceful sit-in, which has now entered its third day.
Demonstrators recently adopted a flash-mob strategy, retreating when pressed by police only to re-emerge at another location.
For many hours people staged a sit-in at the airport, the second since Friday, to attract global attention to their cause.
The entry of the working class of Hong Kong into the protest movement has not only provoked fears in Beijing but also concerns in Washington and among United States allies amid a resurgence of the class struggle internationally.