Anti-extradition bill protesters arrive at Causeway Bay subway station to join the protest, in Hong Kong, China, August 4, 2019.

Demonstrators attend a rally to support the city-wide strike and to call for democratic reforms at New Town Plaza shopping mall in Hong Kong, China, August 5, 2019.

A passenger leaves following a suspension of train services after protesters disrupted Mass Transit Railway (MTR) services, at Fortress Hill station in Hong Kong, China August 5, 2019.

A commuter argues with a protester as a train is stalled during disruption of the Mass Transit Railway (MTR) services by protesters, in Hong Kong, China August 5, 2019.

An elderly woman is helped by a demonstrator after police fired tear gas during a demonstration in support of the city-wide strike and to call for democratic reforms at Tin Shui Wai in Hong Kong, China, August 5, 2019.

Protesters use umbrellas as they form a barricade during a demonstration in support of the city-wide strike and to call for democratic reforms outside Central Government Complex in Hong Kong, China, August 5, 2019.

Protesters attend a demonstration in support of the city-wide strike and to call for democratic reforms at Tai Po residential area in Hong Kong, China, August 5, 2019.

A doll left by the protesters lies on the ground as riot police officers block the street during a demonstration in support of the city-wide strike and to call for democratic reforms at Tai Po residential area in Hong Kong, China, August 5, 2019.

An anti-extradition bill protestor protects himself from falling tear gas canisters using an umbrella in Hardcourt Road, Admiralty, in Hong Kong, China, August 5, 2019.

Hong Kong police line up after protersters blocked the Cross Harbour Tunnel in Hong Kong, China, August 5, 2019.

Anti-extradition bill protesters block a police car on Victoria Road in Hong Kong, China, August 4, 2019.

A demonstrator paints a graffiti reading "Strike on May 1st, the Government is a dog", an anti-extradition bill protest in Causeway Bay, Hong Kong, China, August 4, 2019.

Police officers hold a banner that warns protesters for tear gas, during an anti-extradition protest in Hong Kong, China, August 4, 2019.

Demonstrators react as riot police point strong flashlights to their face after an anti-extradition bill protest in Hong Kong, China August 5, 2019.

Protesters use barricades to block the road at the Cross-Harbour Tunnel in Hong Kong, China August 5, 2019.

Protesters react after tear gas was fired by the police during a demonstration in support of the city-wide strike and to call for democratic reforms at Tai Po residential area in Hong Kong, China, August 5, 2019.

A protester covers a tear gas canister fired by the police during a demonstration in support of the city-wide strike and to call for democratic reforms at Tai Po residential area in Hong Kong, China, August 5, 2019.

Police officers hold a banner that warns protesters for tear gas, during an anti-extradition protest in Hong Kong, China, August 4, 2019.

Demonstrators are seen amidst smoke from tear gas during an anti-extradition bill protest in Hong Kong, China, August 4, 2019.

Riot police block off a residential area during an anti-extradition bill protest in Des Voux Road, Hong Kong, China, August 4, 2019.

A Mass Transit Railway (MTR) personnel holds up a stop sign towards protesters who are disrupting MTR services at Fortress Hill station in Hong Kong, China August 5, 2019.

Protesters stand at a door of a Mass Transit Railway (MTR) subway train to disrupt its service at Fortress Hill station in Hong Kong, China August 5, 2019.

Workers remove barricades that were placed by protesters to block the road, at the Cross-Harbour Tunnel in Hong Kong, China August 5, 2019.

Traffic is seen after protesters placed barricades to block the road, at the Cross-Harbour Tunnel in Hong Kong, China August 5, 2019.

Protesters take cover during a demonstration in support of the city-wide strike and to call for democratic reforms outside Central Government Complex in Hong Kong, China, August 5, 2019.

A protester reacts after tear gas was fired by the police during a demonstration in support of the city-wide strike and to call for democratic reforms at Tai Po residential area in Hong Kong, China, August 5, 2019.

A protester covers a tear gas canister fired by the police with a plate during a demonstration in support of the city-wide strike and to call for democratic reforms at Tai Po residential area in Hong Kong, China, August 5, 2019.

A protester uses his hand to prevent the doors of a Mass Transit Railway (MTR) subway train from closing during a disruption of MTR services at Fortress Hill station in Hong Kong, China August 5, 2019.

Passenger exit a stalled train during a disruption of Mass Transit Railway (MTR) services by protesters at Fortress Hill station in Hong Kong, China August 5, 2019.

Mass Transit Railway (MTR) subway personnel try to prevent a protester from blocking the door of a train as protesters disrupt MTR services at Fortress Hill station in Hong Kong, China August 5, 2019.