Following the bloodiest day since the military seized power in Myanmar, US Secretary of State Antony Blinken said Saturday that Washington was “horrified” by the killings carried out by security forces, lashing out at “the military’s reign of terror.”

“We are horrified by the bloodshed perpetrated by Burmese security forces, showing that the junta will sacrifice the lives of the people to serve the few,” Blinken said in a tweet.

“I send my deepest condolences to the victims’ families. The courageous people of Burma reject the military’s reign of terror.”

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Myanmar has been in turmoil since the generals ousted and detained civilian leader Aung San Suu Kyi in February, triggering a major uprising demanding a return to democracy.

The country’s capital Naypyidaw saw a grand parade of troops and military vehicles on Saturday morning, with a speech by junta leader Min Aung Hlaing warning that acts of so-called “terrorism” were unacceptable.

Myanmar’s local monitoring group Assistance Association for Political Prisoners (AAPP) confirmed 89 people were killed by “early evening”, AFP reported.

Meanwhile, UN Secretary-General Antonio Guterres also condemned “in the strongest terms the killing of dozens of civilians, including children and young people, by security forces in Myanmar today,” his spokesman said.

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“The continuing military crackdown … is unacceptable and demands a firm, unified and resolute international response.”

Over 330 people have died in demonstrations against the coup — including a large number killed by direct headshots from security forces — and more than 3,000 others have been arrested, according to the AAPP.