YANGON (BLOOMBERG) - Myanmar's junta has moved the nation's civilian leader Aung San Suu Kyi and former president Win Myint from their residences in the capital to an "unknown location", according to allies who have expressed serious concerns for their safety.

The two have been held by the country's powerful military since it seized power in a coup on Feb 1.

"We've heard from reliable sources that President Win Myint and State Counsellor Aung San Suu Kyi have been moved to another unknown location," the shadow government formed by Ms Suu Kyi's National League for Democracy party and allies, also known as the National Unity Government, said in a statement on Monday (May 31).

Ms Suu Kyi, who once defended the military's brutal crackdown on Rohingya minorities at the International Court of Justice, is facing six criminal charges including violating state secrets and incitement.

Mr Win Myint is also charged with incitement and breaching Covid-19 restrictions.

The head of the legal defence team for both leaders, Mr Khin Maung Zaw, said Ms Suu Kyi had told lawyers during a meeting before her court appearance on May 24 that she had been moved one night earlier to an unfamiliar location.

"After the court hearing, we lawyers have no contact with her at all," he said.

"She's a much-loved leader of our state so we have been extremely concerned about her safety since day one and such concerns are still there."

Labelling the regime a "terrorist military council", the National Unity Government reiterated its efforts to ensure accountability and justice and urged the junta to take responsibility for its actions after the coup and against ethnic nationalities.