(CNN)- Concerns are growing over the potential for violence in Myanmar as anti-coup protesters urge supporters to take to the streets en masse, in defiance of the military generals who have deployed troops in major cities.

Protests and civil disobedience movements against the military coup on February 1 have been the biggest in decades, with thousands calling for ousted civilian leader Aung San Suu Kyi to be released from detention and power be handed back to civilian control.

A mas rally in downtown Yangon was called for Wednesday, after a second charge was filed against Suu Kyi Tuesday. Her lawyer Khin Maung Zaw said that she had been charged in relation to a national disaster law, in addition to an earlier count under the country's import and export act.

"Let's gather in millions to take down the dictators," activist Khin Sandar wrote on Facebook, according to Reuters.