Foreigners, including US, British, Japanese and Australian citizens, have been held since the military seized power last year, arrests that human rights groups say are designed to discourage dissent.
No group has claimed responsibility for the blast that hit Yangon's Downtown district, killing at least one person and wounding nine others.
Opponents of the military rule have marked the one-year anniversary of the army’s seizure of power with a nationwide strike to show their strength and solidarity amid international concerns.
The announcement from the humanitarian body came as Uganda and the Democratic Republic of Congo claimed to capture 34 rebels in a joint military operation in eastern DRC.
Nationwide "silent strike" comes after deposed leader Aung San Suu Kyi was sentenced to four years in prison.
At least five demonstrators were killed in Yangon where anti-coup protests still continue after the military toppled the civilian government on February 1.
The killing of at least 65 protesters in Myanmar’s biggest city of Yangon earlier this year was "planned" and premeditated, says Human Rights Watch.
The general's announcement would place Myanmar in the military's grip for nearly two and a half years – instead of the initial one-year timeline the junta announced days after the coup.
Meanwhile deposed leader Aung San Suu Kyi has suffered a legal setback after a judge denied her lawyers’ motion to disqualify prosecution testimony against her on a sedition charge.
Despite international pressure, the junta continues to hold power and has not given ground to protestors.
Military shells positions held by newly formed Chinland Defence Forces, which has led fighting in Mindat town in northwestern Chin State.
New designation means anyone including journalists speaking to lawmakers and politicians ousted in a February coup can be subjected to charges under counter-terrorism laws.
Subscribe to our Youtube channel for all latest in-depth, on the ground reporting from around the world.
Copyright © 2022 TRT World.