During the weekend protests, website Hong Kong Free Press showed footage of one arrest that appeared to include officers in plain clothes pinning a demonstrator pressed to the ground.
Conflicts between Hong Kong protesters and police erupted on Sunday, resulting in a woman's right eye being struck by a pellet and causing concern of going blind, according to the news outlet.
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.
Tear gas was sacked at the blackshirted crowds in districts on Hong Kong island, Kowloon and the New Territories, with one young female medic hospitalised after being shot in the right eye, triggering a protest by medical workers who wore bloodied patches over their eyes.
Organisers of the protests have called for a million people to take over the airport today as a reaction for alleged police brutality.
Flights have been cancelled at Hong Kong's worldwide airport as thousands of anti-government protesters flooded the building.
Elsewhere, two petrol bombs were thrown at police and at least one officer suffered burns.
Yesterday protests occurred in a number of locations in Hong Kong, with protesters, many of whom are young, playing cat-and-mouse with police.
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A government official said 45 people were injured in the clashes, including two who were in serious condition.
Air traffic controllers and airline staff, including pilots, took part in the protests and strike last Monday, which affected some 200 flights.
"Youngspiration hereby urge governments of the world and all freedom-loving people on Earth, to stand against China, the Enemy of Humanity, and its executioners, the Hong Kong Police Force and the incompetent Carrie Lam government", it said.
As the unrest show no signs of stopping, and as a response to their demands from the Hong Kong government stays wanting, protesters have increasingly turned to the global community for potential relief.
Businesses, both global and local, in Hong Kong have also faced pressure and accusations of acting in concert or sympathizing with the protesters.
Hong Kong media reported that about 2,000 protesters took part in the sit-on on August 10, as some greeted arriving passengers with pamphlets in English and Chinese explaining their protests while apologizing for the inconvenience that they had caused.
"The police have told a lot of lies to Hong Kong people".
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 USA allies amid a resurgence of the class struggle internationally.
About 75 million passengers passed through the airport - which is a major worldwide transit hub - in 2018.
On Friday, China's Civil Aviation Administration said it will ban Cathay Pacific staff from supporting or participating in "illegal demonstrations, protests and violent attacks, as well as those who have had radical behaviours" from working on flights.