About 50 people were reported killed when troops and police opened fire on protesters in various areas on Sunday. Most deaths were in Yangon.
Protesters are demanding the release of ousted civilian leader Aung San Kyi.
She heads the National League for Democracy (NLD) which saw a landslide victory in elections last November.
The military detained most of the NLD leadership after the coup, alleging voter fraud. No proof has been provided.
Ms Suu Kyi has been held at an unknown location since the 1 February coup. She is due to face a slew of charges her supporters say are fabricated.
On Monday, she was due to appear in court, but the virtual hearing was adjourned due to internet problems.