So far, nearly 770 people have been killed in deadly crackdowns, according to a local monitoring group -- though the junta has a far lower death toll which it blames on "rioters".
The junta on Saturday staged a major show of might for its annual Armed Forces Day as the death toll from crackdowns since the coup climbed to at least 423.
Myanmar has been in turmoil since the military ousted and detained Suu Kyi last month, triggering daily protests around the country to demand the junta restore democracy.
"We aren't doing this for a week or a month -- we are determined to do this until the end when (Suu Kyi) and President U Win Myint are released," one bank employee who had joined the protest told AFP.
"They fired warning shots to the sky two times, then they fired (at protesters) with rubber bullets," a resident told AFP, adding that he saw some people injured.