The Karen National Union said they had been targeted in air strikes late Saturday, hours after the ethnic armed group seized a military base.
Hsa Moo, an ethnic Karen and human rights activist, said three people were killed and at least eight injured.
It was the first air assault in 20 years in the state and targeted the Fifth Brigade of the Karen National Union (KNU) -- one of the country's largest armed groups -- which says it represents the ethnic Karen people.
Japanese Foreign Minister Toshimitsu Motegi on Sunday condemned the continued use of deadly force by Myanmar's military and police against civilians, Kyodo reported.
A day after more than 100 protesters were killed by Myanmar's security forces, Motegi issued a statement saying that the Japanese government "strongly condemns" such action continuing despite repeated calls from the international community to immediately stop resorting to violence against civilians.
US President Joe Biden on Sunday decried the bloodshed unleashed against anti-coup protesters in Myanmar as "absolutely outrageous," after security forces killed more than 100 people including at least seven children.
On Saturday, at least 107 people were killed across Myanmar as security forces opened fire on protesters.
"It's terrible," Biden told reporters in brief remarks he gave in his home state of Delaware.
"It's absolutely outrageous and based on the reporting I've gotten, an awful lot of people have been killed totally unnecessarily."
US President Joe Biden has invited his counterparts Xi Jinping of China and Russia's Vladimir Putin to a virtual climate summit he is hosting in April, the White House announced on Friday.
In all, 40 world leaders have been asked to attend the two-day meeting meant to mark Washington's return to the front lines of the fight against man-made climate change, after former president Donald Trump disengaged from the process.
A UN panel ended five weeks of arduous negotiations on Friday with a watered-down declaration on the status of women around the world.
European diplomats accused Russia of being obstructionist and undermining the rights of women and girls in the 65th annual proceedings of the Commission on the Status of Women.
A village watchman trains his binoculars on a suspicious fishing boat -- the first line of defence as Thailand braces for a fresh methamphetamine influx after a coup in neighbouring Myanmar.
The kingdom's narcotics bureau has already seized more than 80 million "yaba" pills just in the past six months, a record haul partly blamed on a supply glut caused by the coronavirus pandemic.
A local police station in Dala township, located on the opposite bank of Yangon city, was surrounded by the residents after two women were arrested by the police on 26 March.
About 5,000 people in the suburbs of Yangon gathered near the police station, calling for the release of the two women, one aged 19 and the other 30, but police fired on the protesters with rubber bullets and sound bombs.
A man was reportedly wounded in the thigh by a rubber bullet.
Myanmar Peace Sangha Union Members in Sri Lanka visited and paid homage Saturday to the Mahāceti, one of most sacred Buddhist Stupas in which it is said that most of Buddha’s holy relics are enshrined.
On this holy spot, Sangha members recited Metta Sutta and Mora Sutta in order for the Myanmar State detainees including the President Win Myint, the State Counsellor Aung San Suu Kyi and other detainees to be released immediately.
The leader of the Catholic Church in Myanmar has appealed to protesters to refrain from violence amid an increasingly brutal military crackdown, according to Christian Today.
The call from Cardinal Charles Bo follows reports that a 6-year-old girl was shot dead after security forces raided her family's home in Mandalay.
Cardinal Bo called on demonstrators to maintain the high ground and be peaceful.
The Chiefs of Defense of Australia, Canada, Germany, Greece, Italy, Japan, the Kingdom of Denmark, the Kingdom of the Netherlands, New Zealand, the Republic of Korea, the United Kingdom, and the United States of America released a statement yesterday condemning the Myanmar Armed forces for its use of violence against citizens across the country.