Police sprays protesters with a water cannon during an anti-government demonstration, in Bangkok, Thailand July 18, 2021.

A protester stands as police spray water cannon during an anti-government demonstration, in Bangkok, Thailand July 18, 2021.

A protester gestures as they clash with police during an anti-government demonstration, in Bangkok, Thailand July 18, 2021.

Protesters show the three-finger salute as they burn mock body bags, representing casualties of coronavirus disease (COVID-19), during an anti-government demonstration, in Bangkok, Thailand July 18, 2021.

An anti-government protester pours water on the eyes of other demonstrator as they clash with police during a march toward the Government House, demanding Thai Prime Minister Prayuth Chan-ocha resignation, mandatory vaccination policy and reform in the monarchy, in Bangkok, Thailand, July 18, 2021.

Protesters hide as police spray water cannon during an anti-government demonstration, in Bangkok, Thailand July 18, 2021.

Protesters cover as they clash with police during an anti-government demonstration, in Bangkok, Thailand July 18, 2021.

An anti-government protester holds a mock body bag, representing a casualty to COVID-19 outbreak, during an anti-government march from Democracy Monument to Government House, in Bangkok, Thailand, July 18, 2021.

A protester rides a bike as they clash with police during an anti-government demonstration, in Bangkok, Thailand July 18, 2021.

Protesters take cover as they clash with police during an anti-government demonstration, in Bangkok, Thailand July 18, 2021.

Anti-government demonstrators burn mock body bags, representing casualties of the coronavirus disease (COVID-19) outbreak, and a puppet depicting Thai Prime Minister Prayuth Chan-ocha during an anti-government march from Democracy Monument to Government House, in Bangkok, Thailand, July 18, 2021.

Police are seen during an anti-government march from Democracy Monument to Government House, in Bangkok, Thailand, July 18, 2021.

Anti-government protesters march toward the Government House, demanding Thai Prime Minister Prayuth Chan-ocha resignation, mandatory vaccination policy and reform in the monarchy, in Bangkok, Thailand July 18, 2021.

Riot police officers stand guard as they clash with anti-government protesters during a march toward the Government House, demanding Thai Prime Minister Prayuth Chan-ocha resignation, mandatory vaccination policy and reform in the monarchy, in Bangkok, Thailand, July 18, 2021.

Mock body bags that depict casualties of the coronavirus disease (COVID-19) outbreak burn during an anti-government demonstration, in Bangkok, Thailand July 18, 2021.

Protesters show the three-finger salute as they burn mock body bags, representing casualties of coronavirus disease (COVID-19), during an anti-government demonstration, in Bangkok, Thailand July 18, 2021.

Anti-government protesters clash with riot police during a march toward the Government House, demanding Thai Prime Minister Prayuth Chan-ocha resignation, mandatory vaccination policy and reform in the monarchy, in Bangkok, Thailand, July 18, 2021.

Mock body bags, representing casualties of the coronavirus disease (COVID-19) outbreak, burn during an anti-government march from Democracy Monument to Government House, in Bangkok, Thailand, July 18, 2021.

Protesters are seen on a road as they clash with police during an anti-government demonstration, in Bangkok, Thailand July 18, 2021.

A protester places mock body bags on a picture of Thai Prime Minister Prayut Chan-o-cha to depict casualties of the coronavirus disease (COVID-19) outbreak, during an anti-government march from Democracy Monument to Government House, in Bangkok, Thailand July 18, 2021.

Anti-government protesters hold a placard depicting a dog with the head of Thai Prime Minister Prayuth Chan-ocha, as they march toward the Government House, demanding Prayuth Chan-ocha resignation, mandatory vaccination policy and reform in the monarchy, in Bangkok, Thailand, July 18, 2021.

A protester looks on during an anti-government demonstration, in Bangkok, Thailand July 18, 2021.

A protester pours water on another demonstrator's face as they clash with police during an anti-government demonstration, in Bangkok, Thailand July 18, 2021.

Police spray water cannon during an anti-government demonstration, in Bangkok, Thailand July 18, 2021.