Myanmar's elected leader Aung San Suu Kyi and other senior ruling party figures were detained in morning raids on Monday amid fears of a military coup following a disputed election, her National League for Democracy (NLD) party said.
The Myanmar army said it had carried out the detentions in response to "election fraud", according to a statement on a military-owned television station.
A military spokesman did not answer phone calls seeking further comment.
Phone lines to the capital Naypyitaw were not reachable and state TV went off air hours before parliament had been due to sit for the first time since the NLD's