The killing of more than 100 anti-coup protesters in Myanmar has drawn global outrage, with defence ministers of 12 nations condemning the military.
The US accused the security forces of a “reign of terror” on Saturday, the deadliest day since last month’s coup.
Coup leader Min Aung Hlaing and his generals still threw a lavish party that night for Armed Forces Day.
On Sunday, funerals were held, with some reports the military had tried to intervene in the mourning.
More than 400 people have now been killed in the suppression of protests in Myanmar since the 1 February coup.
The military seized control of the South East Asian country after an election which Aung San Suu Kyi’s National League for Democracy (NLD) party won by a landslide.
The defence chiefs of a dozen nations, including the UK, on Sunday issued a rare joint statement condemning the military’s violent actions.
The US, Japan and Australia were also among the signatories of a statement that said: “A professional military follows international standards for conduct and is responsible for protecting – not harming – the people it serves.”
The UK government has also urged all British nationals in Myanmar to “leave the country as soon as possible”.
The Foreign, Commonwealth and Development Office (FCDO) said the advice “follows the significant increase in violence on 27 March”.
“We were previously advising British nationals to leave unless they had an urgent need to stay,” it added.
Security forces opened fire in more than 40 locations on Saturday. The commercial centre, Yangon, saw dozens of deaths, but killings were recorded from Kachin in the north to Taninthartharyi in the far south.
The US said it was “horrified” by the killings. Secretary of State Antony Blinken accused the military of “sacrificing the lives of the people to serve the few.”
UN Secretary-General Antonio Guterres said he was “deeply shocked” by the violence, and British Foreign Secretary Dominic Raab called it a “new low”.
UN Special Rapporteur Tom Andrews called for an international emergency summit.
China and Russia have not joined the criticism, which means taking action through the UN Security Council – where they have vetoes – could be difficult. (Courtesy BBC)