A Japanese envoy has also left for Myanmar on Sunday to urge the military government to thoroughly investigate the killing of a Japanese journalist during an anti-government rally and not to use force to end the protests.
Video journalist Kenji Nagai, 50, was fatally wounded in Yangon on Thursday, apparently shot by a soldier firing at point-blank range.
"One [purpose] is to make sure there is a full investigation into the dreadful incident and to ensure the safety of Japanese nationals," Mitoji Yabunaka, deputy foreign minister, told reporters at Narita airport.
While the international community exerted diplomatic pressure, Myanmar's military government continued to tighten its hold over the streets.
Andrew Kirkwood of the Save The Children told Al Jazeera that the government seemed to be in control of Yangon on Sunday.
"But there is an atmosphere of high tension here," he said.
Two gatherings of a few hundred protesters each emerged at locations in Yangon on Saturday, but security forces quickly swooped with batons and beat them away.
Demonstrations led by monks are being tolerated elsewhere, including the religious capital of Mandalay, but supporters who attach themselves are being generally dispersed.
However in the central city of Pakokku, witnesses said monks led thousands of protesters in a peaceful two-hour march on Saturday that appeared to have been mounted with the approval of local authorities.
Dissidents said on Sunday they were looking for alternative venues to gather, away from the thousands of security forces massed in Yangon.
"We plan to go ahead with our movement," a source involved in the protests said.
Troops have blockaded many big monasteries, including in Mandalay, and monks are only allowed to move around in small groups.
Meanwhile, Myanmar's main internet connection has been cut since Friday, drastically reducing the flow of video, photos and first-hand reports of the violence which have helped inform the world of the crisis.