Police and protesters clashed in Yau Ma Tei on Tuesday as widespread violence broke out throughout Hong Kong.
Tens of thousands of people joined anti-government demonstrations that spread across the semi-autonomous Chinese territory, as Communist leaders in Beijing celebrated 70 years in power.
In an escalation of violence, Hong Kong police shot a protester at close range in the chest, leaving the teenager bleeding and screaming on the ground.
Police said the single pistol shot fired by the officer, as protesters swarmed toward him, hit the 18-year-old on the left side of his chest.
Hong Kong's hospital authority said the teenager was one of two people in critical condition, with a total of 51 people injured in fierce clashes between protesters and police.
While officers have previously fired warning shots in the air on multiple occasions during months of demonstrations in Hong Kong, this was the first time a protester is known to have been shot.
Communist China
Meanwhile, China celebrated its growing power and confidence with a huge display of military hardware and goose-stepping troops in Beijing on Tuesday, overseen by President Xi Jinping who pledged peaceful development on Communist China's 70th birthday.
The event is the country's most important of the year as it looks to project its assurance in the face of mounting challenges, including nearly four months of anti-government protests in Hong Kong and an economy-sapping trade war with the United States.
The former British colony was in lockdown on Tuesday with barricades in the city centre, shuttered stores and a heavy police presence. Embattled Hong Kong leader Carrie Lam is in Beijing for the anniversary celebrations.
More No Comment
Chelsea fans take Super League protests to Stamford Bridge
Crews work to extinguish wildfire on Table Mountain
A touristic house was built upside down in Romania
Workers flee New Delhi as week-long lockdown is announced
Clashes in N.Ireland after protests over Brexit 'protocol'
In Switzerland, the winter man explodes announcing summer
Boris Johnson enjoys post-lockdown pint
Louisville officer punches protester
'We are so lucky': New Zealand-Australia travel bubble opens
Families rejoice travel bubble reunions at New Zealand airport
NASA helicopter breaks records with flight on Mars
Cape Town wildfire spreads to university campus
A look inside the caves of La Paz and La Viña in Spain
Many injured in Egypt's train derailment
Memorial honours victims of 'gun violence epidemic' in the US