"Hong Kong's radical demonstrators have repeatedly used extremely risky tools to attack police officers, which already constitutes a serious violent crime, and also shows the first signs of terrorism emerging", Yang Guang, a spokesman for the Hong Kong and Macau Affairs Office (HKMAO), said at a press briefing.
They dispersed, as noxious smoke also filled the train station there, bringing train passengers to tears.
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.
Yesterday protests occurred in a number of locations in Hong Kong, with protesters, many of whom are young, playing cat-and-mouse with police. "They might miss a day's work and miss a meal, but the fall of Hong Kong would be irreversible", he said.
Undoubtedly there are illusions among the Hong Kong protesters, encouraged by the pan-democrats and some student leaders such as Joshua Wong, that the USA and its allies, Britain in particular, will intervene on their behalf.
"This wantonly tramples on Hong Kong's rule of law and social order". -China trade war - was being undermined by the protests, which began in June.
The British government is concerned about the latest violence in its former colony and wants calm from all sides, a spokesman for British Prime Minister Boris Johnson said on Monday.
Demonstrators, a lot of them young, appeared only to be digging in.
However, China's Civil Aviation Authority issued a warning to Cathay Pacific about the involvement of its staff in "riots".
A Hong Kong Outlanders representative, who identified himself as "Kuma", said the Hong Kong government claimed that a general strike staged on Monday last week was aimed at destroying the territory's economy by dividing the people.
Raab condemned "violent acts by all sides but emphasised the right to peaceful protest", and "underlined that the violence should not cloud the lawful actions of the majority", the United Kingdom foreign office said in a statement.
"We are leaderless, and practically everything is being decided by those on the front lines, and we follow along", said a protester who gave his surname as Cheung. She said she was anxious about escalating violence, but added that "the protesters were just trying to protect themselves against police violence". Riot police used tear gas to disperse the unruly crowds.
Other demands include the withdrawal of charges against arrested protesters, an independent inquiry into police violence, and free elections based on universal suffrage for Hong Kong's legislative and administrative bodies.
Hong Kong police showed off water cannons that could be deployed in the case of future demonstrations, a development which Amnesty International has warned could lead to serious injuries if misused within the densely-populated city's confined spaces.
The demonstrations have since morphed into a broader bid to reverse a slide in democratic freedoms in the city.
At the airport, thousands of activists have occupied the arrivals hall for days.
Older people have also been appearing.
On Aug. 10, two peaceful marches were held during the day. Some protesters were seen walking toward the airport amid the stifling heat.
This weekend's round of pro-democracy rallies marks the tenth straight weekend for the demonstrations.
The city's Beijing-appointed leader Lam has ruled out granting the protesters' demands.
Demonstrators say they are fighting the erosion of the "one country, two systems" arrangement enshrining some autonomy for Hong Kong when China took it back from Britain in 1997.