Myanmar has seen its largest protests in more than a decade, as tens of thousands of people rallied against the military coup and demanded the release of elected leader Aung San Suu Kyi.
"We don't want military dictatorship. We want democracy," the crowds chanted in the main city, Yangon. Rallies were held in more than a dozen other cities.
Internet access has now been restored after a day-long blackout.
The army has not yet commented on the growing opposition to Monday's coup.
The military seized power after claiming, without evidence, that the November election was fraudulent. The rulers declared a year-long state of emergency and have been hunkered down in the capital, Nay Pyi Daw.
Ms Suu Kyi and senior leaders of her National League for Democracy Party (NLD), including President Win Myint, have been put under house arrest.