Hong Kong airport cancels all remaining flights as pro-democracy demonstrators stage more protests.
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.
"Yesterday's police operation was ridiculous", said Nicekayla, a 27-year-old retail worker who, like numerous protesters, declined to use her real name for fear of arrest.
In Beijing, the Cabinet's Hong Kong and Macao Affairs Office issued a statement saying the situation in Hong Kong was "beginning to show the sprouts of terrorism" and constituted an "existential threat" to the population of Hong Kong.
Protesters are expected to gather at the city's worldwide airport for a fourth day in a row on Monday and plan to rally outside police headquarters on Monday night.
"Airport operations at Hong Kong International Airport have been seriously disrupted as a result of the public assembly at the airport today", the statement said.
Mass protests at Hong Kong's global airport have forced flight cancellations to and from Australia.
They also argued the bill would give China more control over Hong Kong.
At the airport, protesters held signs reading "Hong Kong is not safe" and "Shame on police".
Protesters are demanding full withdrawal of the bill, amnesty for all demonstrators arrested in relation to the unrest, a retraction of the government's characterization of the protests as "riots", an independent inquiry into allegations of police use of force, and universal suffrage, which is promised in the territory's charter.
Protesters responded by hurling bricks and spraying riot police with fire extinguishers and water hoses.
Officials said 45 people were hurt in the clashes, including two who were in serious condition.
The woman, who has not been identified, was reportedly hit by a beanbag round fired by police, and rumours circulated that she had lost her vision.
Images of her lying on the ground with blood pouring from her face quickly went viral and featured on posters calling for new demonstrations.
"It is becoming more and more unsafe, but if we don't still come out at this point, our future will become more frightening, and we will lose our freedoms", said one 22-year-old protester who gave her family name as Chan.
The protests have morphed into a broader bid to reverse a slide of democratic freedoms in the southern Chinese city.
The city's Beijing-backed leader has ruled out concessions and warned the protesters were causing economic chaos.
The protesters are resorting to flash mobs and violence as their numbers diminish, according to Steve Vickers, chief executive officer of risk consultancy Steve Vickers and Associates and a former head of the Royal Hong Kong Police Criminal Intelligence Bureau.
Tear gas was also deployed in central Hong Kong on both sides of Victoria Harbour, in the Tsim Sha Tsui area on the Kowloon side and in Wan Chai on Hong Kong Island.
The video shows roughly two dozen armoured carriers apparently driving through the southern city of Guangzhou and other troop carriers leaving eastern Fujian province.
China's civil aviation authority had earlier told Cathay Pacific to ban all employees who supported or joined the recent protests from flying to the mainland, one of the strongest signs yet that Beijing is losing its patience with the demonstrations.