A court in Thailand agreed on Thursday with a police request to revoke the bail of two top leaders of the burgeoning anti-government protest movement who refuse to stop their public political activities. The move to put Arnon Nampa and Panupong Jadnok in custody while police proceed with the cases against them was the first time the activists have been denied release on bail. They can be held for up to 48 days for police investigation without formal charges, but can also apply again for bail during that time. Thai celebrities defy risks to back pro-democracy movement Their arrests were among more than a dozen in recent weeks for sedition and on charges related to demonstrations that police say were in breach of a ban on gatherings imposed to prevent coronavirus infections. Thai activists plan a major protest on September 19. “Let my jailing today be the receipt of harassment against the people. On [September 19] go take it back,” Anon posted on his Facebook . Police had earlier requested the court revoke the bail of the two top leaders of the burgeoning anti-government protest movement for refusing to stop their public political activities. Arnon and Panupong were granted bail last month for charges including sedition arising from a protest rally in Bangkok in July. Police said their continued involvement in demonstrations violates the terms of their release and want the court to order them back into custody. Both men are key figures in the growing protest movement and are among those who are calling for reform of the monarchy, a revered institution that is protected by draconian anti-defamation laws. Speaking to reporters before the hearing, Arnon said he believes that his imprisonment will not deter the movement. “If there is a political accident that puts me and Mike [Panupong] in jail, I will treat it as a complete proof of our participation in the movement, that we fought the best we could,” Arnon said. “Then, I hope that our imprisonment could serve as an inspiration for those who will continue fighting.” The growing protests have emerged as the most serious threat to Prime Minister Prayuth Chan-ocha, a former army general whose administration they accuse of incompetence and corruption. The student-led movement has declared three core demands: holding new elections, amending the constitution and ending the intimidation of critics of the government. Some activists go further, calling for far-reaching reforms to the institution of the monarchy. Thailand’s students are revolting – and Prayuth’s government isn’t sure what to do The authorities have taken legal actions against more than 30 key figures in the movement in an apparent attempt to decapitate it and stall its momentum. Additional reporting by Reuters