In a television address, the army announced that power had been handed to the commander-in-chief of the armed forces, and that it was declaring a national state of emergency for one year.
De facto leader Suu Kyi and several state ministers are being detained in the capital Naypyidaw, according to a spokesman for the governing National League for Democracy (NLD).
The two bodies have attempted to share power since the 2015 elections, Myanmar’s first openly contested poll since the end of military rule. That power sharing relationship now appears to be over following Monday’s coup.
Here’s what you need to know about the situation.