The country has been at loggerheads with the military and civilian administration since Aung San Suu Kyi's National League for Democracy (NLD) won a landslide victory in the November 8 national election.
The army-backed Union Solidarity and Development Party (USDP) refused to accept the results, alleging widespread election fraud.
They demanded fresh elections. It is also hinted that if the demands are not met, the army may return to power through a coup d'état.
The first session of the new parliament was scheduled to take place on Monday (01 February). Earlier, the army detained the party's top leaders, including Aung San Suu Kyi, the head of the National League for Democracy and the mainstay of Myanmar's civilian administration, and President U Win Myint.
The army has also taken NLD central executive committee members, legislators and several regional cabinet members into protective custody.
Just a few hours before the start of the first session of the new parliament, such a naked intervention of the army is being termed as a military coup by various international media.
The army is patrolling the roads of the country. Telephone connection disconnected. All this paints a grim picture of a military coup there.
Aung San Suu Kyi, President Win Myint and other top leaders were detained early on Monday, ruling party spokesman Myo Nyunt told Reuters news agency.
We have to assume that a military coup has taken place. I call upon the people to react in accordance with the law without being agitated.