Police fired the water cannon in brief bursts against a group of the thousands of protesters who had gathered. The video showed some protesters appeared to have been hurt when they were knocked to the ground.
Tens of thousands of people gathered in the streets of Myanmar over the weekend for the biggest protests since the military putsch that removed Suu Kyi a week ago. The country found itself returned to military rule after a 10-year flirtation with democracy.
During a demonstration in the capital, Naypyidaw, authorities used water cannon against anti-coup protesters.
Protesters in the country’s largest city, Yangon, held up “wanted” posters featuring the image of Myanmar’s commander-in-chief, Senior General Min Aung Hlaing.
The AFP news agency reported that there were suspicions that the water had been laced with chemicals.
According to the Reuters news agency, police appeared to stop using the water cannon after protesters made and appeal to them. However, it said, the demonstration continued.
Authorities issue crackdown warning
For the first time on Monday, state media referenced the protests, claiming they were endangering stability in Myanmar.
Later on Monday, state broadcaster MRTV issued a warning on a potential crackdown on protesters, saying that opposition to the military takeover was unlawful.