The military junta disliked the fact that the ambassador last month demanded the release of Prime Minister Suu Kyi and President Win Myint.
Both were arrested in connection with the coup on 1 February. Suu Kyi is still under house arrest.
The ambassador was appointed by Suu Kyi in 2014 and has a military background.
According to the news agency AFP, the ambassador was called home in March, but did not follow the order.
Last night, the ambassador said he would stay outside the embassy all night. According to the BBC, he spent the night in a car outside the building.
“This is my building,” said Kyaw Zwar Minn.
Number two at the embassy, Councilor Chit Win, is said to have been with the military attaché to lock the ambassador out.
The British condemn
– We condemn the bullying from Mynamar’s military regime in London yesterday.
The British Foreign Secretary, Dominic Raab, is tweeting this morning.
There is no doubt about which side the British government supports.
Britain has been a driving force in the work to get the UN Security Council to condemn the attacks on protesters in Myanmar.
The British government has also on several occasions introduced sanctions against economic companies controlled by the military regime in Myanmar.
A famous actor and model was arrested early this morning, local time in Yangon.
Paing Takhon was arrested at his mother’s home. The sister told Reuters that he was picked up by about 50 soldiers who arrived in 8 military vehicles. It is unclear where he is now.
According to the sister, Takhon has felt unwell and has stayed at home for the last few days.
He has over a million followers on social media. But in recent days, his pages have been down, and it is unclear whether it is he or someone else who has removed them.
Takhon has urged people to “stop the crimes against humanity”.
According to France 24 Police are now hunting for around 120 celebrities who support the protests against the military regime.
An organization offering assistance to political prisoners, the AAPP, says at least 598 civilians have been killed and nearly 2,900 arrested in the weeks following the February 1 military coup.