Riot police holds a pepper spray as he tries to disperse anti-government protesters, in Hong Kong, China November 10, 2019.

A man plays the saxophone in Tamar Park, outside the Legislative Council (Legco) building, during a prayer and remembrance ceremony in Hong Kong, China, November 9, 2019.

A still image from a social media video shows a protester try to prevent a police officer from aiming his gun at a protester in Sai Wan Ho, Hong Kong, China November 11, 2019. CUPID PRODUCER via REUTERS.

Protesters build barricades at Hong Kong Polytechnic University in Hong Kong, China November 11, 2019.

A protester throws a stone into a building at Hong Kong Polytechnic University in Hong Kong, China November 11, 2019.

Protesters vandalise a shopping mall during an anti-government demonstration in Tsuen Wan in Hong Kong, China, November 10, 2019.

A police officer points his weapon during an anti-government demonstration in Hong Kong, China, November 10, 2019.

People react to the tear gas during an anti-government demonstration in Hong Kong, China, November 10, 2019.

Riot police walk through a cloud of tear gas during an anti-government protest in Hong Kong, China November 10, 2019.

Letters reading ''Free HK'' are seen in Tamar Park, outside the Legislative Council (Legco) building, during a prayer and remembrance ceremony in Hong Kong, China, November 9, 2019.

Protesters vandalise a Starbucks cafe at a Citywalk shopping mall during an anti-government demonstration in Hong Kong, China, November 10, 2019.

A protester affected by tear gas is assisted by others during an anti-government demonstration at a shopping mall in Tsuen Wan in Hong Kong, China, November 10, 2019.

A man stands looking at a blocked door at a Citywalk shopping mall during an anti-government demonstration in Hong Kong, China, November 10, 2019.

Police retreat from a housing estate in Tseung Kwan O in Hong Kong, China, November 9, 2019.

Police pepper-spray locals and neighbourhood observers after they entered a housing estate in Tseung Kwan O in Hong Kong, China, November 9, 2019.

A woman sits on a bus as fire burns in the middle of the street during an anti-government demonstration in Tsuen Wan in Hong Kong, China, November 10, 2019.

A protester spray paints graffiti at Hong Kong Polytechnic University in Hong Kong, China November 11, 2019.

Protesters are restrained by riot police officers during an anti-government demonstration in Sha Tin, Hong Kong, China November 10, 2019.

Smoke is seen as a protester shields with an umbrella at Hong Kong Polytechnic University in Hong Kong, China November 11, 2019.

A still image from a social media video shows a police officer aiming his gun at a protester in Sai Wan Ho, Hong Kong, China November 11, 2019. CUPID PRODUCER via REUTERS.

A still image from a social media video shows a police officer aiming his gun at a protester in Sai Wan Ho, Hong Kong, China November 11, 2019. CUPID PRODUCER via REUTERS.