Chow was taken to hospital in an unconscious state in the early hours of Monday morning following late-night clashes between police and protesters in Tseung Kwan O district.
The pro-democracy Civic Party said in an announcement on November 8 that it would be suspending all campaign activities for the day, expressing pain upon learning of Chow's death and offering condolences to his family. Some offices were closing early and workers were heading home.
A still image from a social media video shows a police officer aiming his gun at a protester in Sai Wan Ho, Hong Kong on Monday. The protester was then seen lying in a pool of blood with his eyes wide open.
Police denied pushing the 22-year-old student during last Monday's incident or delaying emergency treatment. Other protesters have been seriously injured by police, with two people shot with live ammunition. "There was three sounds, like "pam, pam, pam", Yip said.
"We are calling for an independent and impartial investigation into Chow Tsz-lok's death - as well as all instances of excessive force used against protesters during the Anti-ELAB demonstrations - and to deliver prosecutions, justice and reparation".
Police later fired tear gas in the same area.
A masked assailant also doused a man with a flammable liquid and set him ablaze during an argument. Though engulfed in flames, the man was able to rip off his shirt and douse the blaze.
Reuters could not immediately authenticate the footage.
The centre of violence was on Nathan Road, in the Kowloon district of Mong Kok, one of the most densely populated locations in the world, where activists built barricades and trashed an entrance to the metro station.
Police did not immediately comment on the shooting.
In one incident, an officer fired a live warning shot as his unit faced off with protesters throwing projectiles.
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The protests were sparked by a now-shelved extradition bill to mainland China that many sees as Beijing's creeping interference on legal and other rights guaranteed to Hong Kong when the former British colony returned under Chinese rule in 1997.
Some have called for independence, a red line for Communist Party leaders in Beijing.
China governs Hong Kong under a special "one country, two systems" framework that is meant to give the city more freedoms and liberties than on the mainland.
Protesters mourned Chow Tsz-Lok on Saturday night at a police-approved prayer rally and pledged not to give up their resistance, with chants of "Hong Kong people, revenge" and "Free Hong Kong". All classes were cancelled.
The owner of parking structure released security camera footage earlier in the week that did not show the moment Chow fell but showed that there was no significant tear gas inside the parking structure and that there was no significant police presence inside the parking garage during the critical minutes when Chow reportedly fell.
One of the lawmakers said he would refuse to turn himself in. "The government still isn't listening to us".
In Sha Tin in the northeast, authorities closed a subway station after protesters broke windows and damaged a ticket machine.
Protesters have also called for a general strike on Monday and for people to block public transport, although such calls in the past have often come to nothing.
Some protesters carried white flowers and placards that read: 'Hong Kong is a police state'.
Called "Heaven bless the Martyrs", the prayer and memorial service in Admiralty, organised by activist Ventus Lau Wing-hong with the involvement of the Good Neighbour North District Church, has been approved by police, reports the South China Morning Post.