Anti-government protesters are seen during a protest on China's National Day, in Wong Tai Sin, Hong Kong, China October 1, 2019.

An anti-government protester runs through a cloud of tear gas during a protest in Sham Shui Po district, on China's National Day in Hong Kong, China October 1, 2019.

An anti-government protester is seen during a protest in Sham Shui Po district, on China's National Day in Hong Kong, China October 1, 2019.

An anti-government protester smashes a window of Miniso, a Chinese variety store during a demonstration on China's National Day, in Tsuen Wan, Hong Kong, China October 1, 2019.

Anti-government protesters raise their hands as they march on China's National Day in Hong Kong, China October 1, 2019.

An anti-government protester sets up a barricade at the entrance of Admiralty Station, on China's National Day in Hong Kong, China October 1, 2019.

An anti-government protester carries a molotov cocktail during a protest in Sham Shui Po district, on China's National Day in Hong Kong, China October 1, 2019.

An anti-government protester throws a molotov cocktail during a protest on China's National Day in Hong Kong, China October 1, 2019.

An anti-government protester shelters with a traffic sign during a demonstration in Sha Tin district, on China's National Day in Hong Kong, China October 1, 2019.

Riot police stand guard during a protest in Sham Shui Po district, on China's National Day in Hong Kong, China October 1, 2019.

Riot police detain anti-government protesters during a protest on China's National Day in Hong Kong, China October 1, 2019.

A riot police detain an anti-government protester during a demonstration on China's National Day, in Wong Tai Sin, Hong Kong, China October 1, 2019.

Riot police clash with anti-government protesters during a demonstration in Sha Tin district, on China's National Day in Hong Kong, China October 1, 2019.

An anti-government protester takes cover under an umbrella during a demonstration in Sha Tin district, on China's National Day in Hong Kong, China October 1, 2019.

Fires are seen at Tai Wai Station during an anti-government demonstration, on China's National Day in Hong Kong, China October 1, 2019.

Motorbikes are on fire after they were hit with a molotov cocktail during a protest on China's National Day, in Wong Tai Sin, Hong Kong, China October 1, 2019.

An anti-government protester walks in front of graffiti during a protest in Sha Tin district, on China's National Day in Hong Kong, China October 1, 2019.

A bench is seen in front of a cloud of tear gas during a protest in Sha Tin district, on China's National Day in Hong Kong, China October 1, 2019.

An anti-government protester throws a tear gas canister during a protest in Sha Tin district, on China's National Day in Hong Kong, China October 1, 2019.

Riot police spray blue-coloured water during a protest on China's National Day in Hong Kong, China October 1, 2019.

Anti-government protesters react during a protest on China's National Day, in Wong Tai Sin, Hong Kong, China October 1, 2019.

Anti-government protesters take part in a protest in Sham Shui Po district, on China's National Day in Hong Kong, China October 1, 2019.

Riot police charge at anti-government protesters during a demonstration at Wan Chai district, on China's National Day in Hong Kong, China October 1, 2019.

An anti-government protester sets fire at Cheung Sha Wan Government Offices during a protest in Sham Shui Po district, on China's National Day in Hong Kong, China October 1, 2019.

An anti-government protester throws an object during a demonstration on China's National Day, in Wong Tai Sin, Hong Kong, China October 1, 2019.

Riot police advance during a protest in Sham Shui Po district, on China's National Day in Hong Kong, China October 1, 2019.

Riot police run during a protest on China's National Day in Hong Kong, China October 1, 2019.

An anti-government protester is detained by riot police during a demonstration in Sha Tin district, on China's National Day in Hong Kong, China October 1, 2019.

An anti-government protester enters at the Cheung Sha Wan Government Offices after breaking the door during a protest in Sham Shui Po district, on China's National Day in Hong Kong, China October 1, 2019.

Riot police detain an anti-government protester during a demonstration on China's National Day, in Wong Tai Sin, Hong Kong, China October 1, 2019.

An anti-government protester reacts to tear gas during a demonstration in Sha Tin district, on China's National Day in Hong Kong, China October 1, 2019.

An anti-government protester reacts during a demonstration in Sha Tin district, on China's National Day in Hong Kong, China October 1, 2019.