Police officers push pro-democracy demonstrators as they clash during a Thai anti-government mass protest, on the 47th anniversary of the 1973 student uprising, in Bangkok, Thailand October 14, 2020.

Detained protesters look out from a prison vehicle during the 47th anniversary of the 1973 student uprising, in Bangkok, Thailand October 15, 2020.

A royalist and an anti-government demonstrator point out at each during a Thai anti-government mass protest, on the 47th anniversary of the 1973 student uprising, in Bangkok, Thailand October 14, 2020.

Anti-government demonstrators march during a Thai anti-government mass protest, on the 47th anniversary of the 1973 student uprising, in Bangkok, Thailand October 14, 2020.

A pro-democracy demonstrator gives a three-finger salute during a Thai anti-government mass protest, on the 47th anniversary of the 1973 student uprising, at the Democracy Monument in Bangkok, Thailand October 14, 2020.

Security personnel form a human chain during a Thai anti-government mass protest, on the 47th anniversary of the 1973 student uprising, in Bangkok, Thailand October 14, 2020.

A demonstrator is carried on a stretcher during a Thai anti-government mass protest, on the 47th anniversary of the 1973 student uprising, in Bangkok, Thailand October 14, 2020.

A person flashes the three-fingers salute in the middle of a message reading "Long live the people" painted on the pavement during a Thai anti-government mass protest, on the 47th anniversary of the 1973 student uprising, near the Democracy monument, in Bangkok, Thailand October 14, 2020.

A royalist holds a picture of Thailand's King Maha Vajiralongkorn near the Royal Plaza in Bangkok, Thailand, October 14, 2020.

A royalist dressed-up as Batman holds a picture of Thailand's King Maha Vajiralongkorn, near the Royal Plaza in Bangkok, Thailand, October 14, 2020.

A pro-democracy demonstrator holds a placard as they walk past a portrait of King Maha Vajiralongkorn during a Thai anti-government mass protest, on the 47th anniversary of the 1973 student uprising, in Bangkok, Thailand October 14, 2020.

A royalist argues with pro-democracy demonstrators as they march during a Thai anti-government mass protest, on the 47th anniversary of the 1973 student uprising, in Bangkok, Thailand October 14, 2020.

Pro-democracy demonstrators flash a three-finger salute while sitting on the ground during a Thai anti-government mass protest, on the 47th anniversary of the 1973 student uprising, in Bangkok, Thailand October 14, 2020.

Stickers are pictured during a Thai anti-government mass protest, on the 47th anniversary of the 1973 student uprising, at the Government House in Bangkok, Thailand October 14, 2020.

A person flashes the three-fingers salute during a Thai anti-government mass protest, on the 47th anniversary of the 1973 student uprising, near the Democracy monument, in Bangkok, Thailand October 14, 2020.

A person takes part in a Thai anti-government mass protest, on the 47th anniversary of the 1973 student uprising, near the Democracy monument, in Bangkok, Thailand October 14, 2020.

A pro-democracy demonstrator flashes a three-finger salute while holding up a rose during a Thai anti-government mass protest, on the 47th anniversary of the 1973 student uprising, in Bangkok, Thailand October 14, 2020.

Pro-democracy demonstrators scuffle with police during a Thai anti-government mass protest, on the 47th anniversary of the 1973 student uprising, in Bangkok, Thailand October 14, 2020.

Pro-democracy demonstrators gather outside the Government House during a Thai anti-government mass protest, on the 47th anniversary of the 1973 student uprising, in Bangkok, Thailand October 15, 2020.

Anti-government demonstrators hold roses during a Thai anti-government mass protest, on the 47th anniversary of the 1973 student uprising, in Bangkok, Thailand October 14, 2020.

A pro-democracy demonstrator gives a three-finger salute during a Thai anti-government mass protest, on the 47th anniversary of the 1973 student uprising, in Bangkok, Thailand October 14, 2020.

A pro-democracy demonstrator wears a helmet with roses on it during a Thai anti-government mass protest, on the 47th anniversary of the 1973 student uprising, in Bangkok, Thailand October 14, 2020.

Thailand's King Maha Vajiralongkorn and Queen Suthida are pictured as the motorcade drives towards the Grand Palace in Bangkok, Thailand October 14, 2020.

Pro-democracy demonstrators try to remove a fence during a Thai anti-government mass protest, on the 47th anniversary of the 1973 student uprising, in Bangkok, Thailand October 14, 2020.

Riot police take up positions after a clash with anti-government protesters during a protest on the 47th anniversary of the 1973 student uprising, in Bangkok, Thailand October 15, 2020.

Pro-democracy demonstrators march during a Thai anti-government mass protest, on the 47th anniversary of the 1973 student uprising, in Bangkok, Thailand October 14, 2020.

People make a human chain during a Thai anti-government mass protest, on the 47th anniversary of the 1973 student uprising, in front of the Democracy monument, in Bangkok, Thailand October 14, 2020.

Anti-government demonstrators march while royalists stand in front of them during a Thai anti-government mass protest, on the 47th anniversary of the 1973 student uprising, in Bangkok, Thailand October 14, 2020.

Pro-democracy demonstrators hold roses during a Thai anti-government mass protest, on the 47th anniversary of the 1973 student uprising, in Bangkok, Thailand October 14, 2020.

Royalists hold pictures of Thailand's King Maha Vajiralongkorn and Queen Suthida near the Royal Plaza in Bangkok, Thailand, October 14, 2020.

Pro-democracy demonstrators and royalists clash during a Thai anti-government mass protest, on the 47th anniversary of the 1973 student uprising, in Bangkok, Thailand October 14, 2020.

An anti-government demonstrator skates over an image of Thailand's Prime Minister Prayuth Chan-ocha during a Thai anti-government mass protest, on the 47th anniversary of the 1973 student uprising, in Bangkok, Thailand October 14, 2020.

A car of the royal motorcade drives past a Thai anti-government mass protest, on the 47th anniversary of the 1973 student uprising, in Bangkok, Thailand October 14, 2020.

Anti-government demonstrators try to break police line during a Thai anti-government mass protest, on the 47th anniversary of the 1973 student uprising, in Bangkok, Thailand October 14, 2020.

Pro-democracy demonstrators gather outside the Government House during a Thai anti-government mass protest, on the 47th anniversary of the 1973 student uprising, in Bangkok, Thailand October 14, 2020.

A royalist carries a flag of Thailand as pro-democracy demonstrators stage a Thai anti-government mass protest, on the 47th anniversary of the 1973 student uprising, in Bangkok, Thailand October 14, 2020.

People flash the three-fingers salute as a royalists' bus passes near them during a Thai anti-government mass protest, on the 47th anniversary of the 1973 student uprising, near the Democracy monument, in Bangkok, Thailand October 14, 2020.

A human rights lawyer Arnon Nampa speaks before he was detained, during a Thai anti-government mass protest, on the 47th anniversary of the 1973 student uprising, in Bangkok, Thailand October 14, 2020.