Pro-democracy protesters flash the three-fingers salute as they attend a mass rally to call for the ouster of prime minister Prayuth Chan-ocha's government and reforms in the monarchy, in Bangkok, Thailand, September 19, 2020. Thousands of protesters in Thailand's capital demonstrated against the government of former coup leader and Prime Minister Prayuth Chan-ocha on Saturday, with many also demanding reforms to the powerful monarchy. REUTERS/Chalinee Thirasupa

Pro-democracy protesters hold placards as they attend a mass rally to call for the ouster of prime minister Prayuth Chan-ocha's government and reforms in the monarchy, in Bangkok, Thailand, September 19, 2020. Protests have been building since mid-July to call for the removal of the government, a new constitution and elections. They have also broken a long-standing taboo by criticising the monarchy of King Maha Vajiralongkorn. REUTERS/Soe Zeya Tun

A pro-democracy protester does a three-fingered salute at the Sanam Luang park during a mass rally to call for the ouster of prime minister Prayuth Chan-ocha's government and reforms in the monarchy, in Bangkok, Thailand, September 19, 2020. Police said at least 5,000 people had gathered at the campus of Thammasat University, long seen as a hotbed of opposition to the military and royalist establishment, and scene of a massacre of protesters in 1976. REUTERS/Jorge Silva

Pro-democracy protesters attend a mass rally to call for the ouster of prime minister Prayuth Chan-ocha's government and reforms in the monarchy, at the Sanam Luang park, in Bangkok, Thailand, September 19, 2020. REUTERS/Jorge Silva

A pro-democracy protester flashes the three-fingers salute as he attends a mass rally to call for the ouster of prime minister Prayuth Chan-ocha's government and reforms in the monarchy, in Bangkok, Thailand, September 19, 2020. REUTERS/Jorge Silva

A pro-democracy protester does the three-fingers salute during a mass rally to call for the ouster of Prime Minister Prayuth Chan-ocha's government and reforms in the monarchy, in Bangkok, Thailand, September 19, 2020. REUTERS/Soe Zeya Tun