The Nepal citizens' group in the statement said they demand a coordinated global campaign to restore constitutional order, and to isolate and penalise Myanmar's armed forces as well as individual military officers.
In an ominous warning on Friday evening, state television said protesters were "in danger of getting shot to the head and back".
The dead included 40 people, one of them a 13-year-old girl, in Myanmar's second city of Mandalay.
On 1 February, following a general election in which Aung San Suu Kyi's National League for Democracy party won by a landslide, the military seized control of the country and declared a year-long state of emergency.
More than 400 people have now been killed in the suppression of protests in Myanmar since the 1 February coup. "If they continue to shoot at protesters and bully the people, I think all the ethnic groups would not just stand by and do nothing".
The Myanmar Now news portal said at least 114 people were killed across the country in the crackdown on Saturday.
An anti-coup protester discharges a fire extinguisher to counter the impact of the tear gas fired by police during a demonstration in Yangon, Myanmar. One person was killed when troops opened fire overnight on a group of protesters near the capital Naypyitaw, Myanmar Now news reported.
The military government further escalated the use of deadly force Saturday with fighter jets launching air strikes in an area near the Thai border controlled by an armed ethnic group dedicated to overturning the coup, according to Reuters.
Calling on the worldwide community to "act quickly before it's too late" and bring in coordinated, targeted sanctions, he told Sky News that the military must release democratically elected leader Aung San Suu Kyi and come to the negotiating table.
Armed Forces Day commemorates resistance to Japanese occupation during World War II and traditionally involves a review of thousands of soldiers, along with tanks, missiles and helicopters.
The KIA's attacks took place at around 3:00am and continued into the early morning on March 28.
Suu Kyi, Myanmar's most popular civilian politician, remains in detention at an undisclosed location.
On March 25, the U.S. Treasury Department issued new sanctions targeting two Myanmar military holding companies-the Myanmar Economic Holdings Public Company Limited (MEHL) and Myanmar Economic Corporation Limited-and the U.K. Foreign Secretary imposed sanctions against MEHL.
"Words of condemnation or concern are frankly ringing hollow to the people of Myanmar while the military junta commits mass murder against them", the United Nations special rapporteur for Myanmar, Mr Tom Andrews, said.
"A failed state in Myanmar has the potential to draw in all the big powers - including the US, China, India, Russia, and Japan - in a way that could lead to a serious global crisis", he wrote on Twitter.
That number is expected to rise because several people were seriously wounded during the security forces' shooting spree on Sunday. Both had enjoyed good ties with the Myanmar military and had hosted Min Aung Hlaing as commander in chief of its armed forces and other key generals, now members of the junta, which calls itself the State Administration Council.