Student-led rallies calling for education reform have twice been brutally suppressed in recent days, drawing fierce criticism from overseas and Aung San Suu Kyi's opposition, which said the tactics echoed those used under the former military government.
In chaotic scenes on Tuesday, police armed with batons lashed out at students and activists in the central town of Letpadan, arresting 127 people and carting them off to prison by the truckload.
"Our human rights have been violated!" shouted the detained activists, some sporting visible injuries, as they were whisked away from the court, according to an AFP photographer at the scene.
Family members said the group of 20 women and 40 men faced five separate charges relating to the protests, with another hearing on March 25. It was unclear whether the other detainees have already been to court or are set to do so.
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Myanmar's information ministry late Wednesday said "action will be taken" against those activists considered "masterminds" of the rally, in a statement on its website.
Ten monks are also set to be sent back to their monastery.
"We are worried for our daughter's situation. We have heard that she was beaten," Ne Win, the father of graduate and activist Phyo Phyo Aung, told AFP earlier, as he waited outside Tharrawaddy prison, where most protesters are believed to be held.
Students have long been at the forefront of political action in the former military-run nation's turbulent history, leading mass protests in 1988 that saw the rise of Suu Kyi and her party but which were brutally quashed by the military.
Phone Piay Kywe, one of only two activists thought to have been released from detention, said police beatings had continued even after demonstrators were held.