- A Hong Kong protester is in critical condition after being shot by police on Monday.
- Separately, a man was doused with an unknown liquid and set aflame. He also is in critical condition, said police.
- The latest mass demonstrations come after three pro-democracy lawmakers were arrested on Saturday.
Protests in Hong Kong took a violent turn Monday, heightening an already volatile situation days after a group of pro-democracy lawmakers was arrested in the city.
In one incident, a Hong Kong protester is in critical condition after being shot by police on Monday morning local time. A hospital press officer who spoke to CNBC confirmed that the 21-year-old man suffered a gunshot wound.
The police spokesperson said the officer involved in the shooting fired three times. That incident occurred at around 7 a.m. local time outside the Sai Wan Ho Mass Transit Railway station.
In an unrelated incident, police said "rioters" poured "flammable liquid" on a man and set him on fire. Speaking at an afternoon press conference, Hong Kong police said the incident occurred at the Ma On Shan MTR station and the man is in critical condition at a hospital.
Police said they are investigating the fire attack and made no mention of arrests.
Disturbing and graphic videos of those two incidents and other violence circulated widely on social media Monday.
In the last week, authorities have arrested a total of 266 people between the ages of 11 and 74, the Hong Kong police said Monday.
On Sunday, protesters blocked roads and vandalized shopping malls across Hong Kong's New Territories and Kowloon Peninsula during another weekend of anti-government demonstrations.
The latest mass demonstrations come after three pro-democracy lawmakers were arrested on Saturday and reports indicated that others were warned they soon could be taken into custody.
Hong Kong is scheduled to hold local elections this month.
Among the demands made by protesters is a more representative democracy to choose the city leader, who is currently elected by a small, most pro-Beijing group of elites.
Hong Kong currently operates under the "one country, two systems" principle where Beijing gives Hong Kong citizens some legal and economic freedoms that it denies people on mainland China.
On Friday, a 22-year-old protester died in the hospital following a fall from a height near a clash with police. His death sparked several protests, including flash-mob demonstrations at lunchtime on Friday and a rally near the government headquarters on Sunday.
Multiple universities in Hong Kong suspended classes Tuesday.
Hong Kong stocks tumbled Monday, with the Hang Seng index falling 2.6 percent. Mainland China companies comprise about half of the firms listed on the exchange, according to the latest figures from the CIA World Factbook.