Residents said a junta jet dropped two 500-lb (226-kg) bombs on the facility.
The strike occurred on International Human Rights Day and injured 76 people, including 27 listed in critical condition.
Separately, the Committee Representing Pyidaungsu Hluttaw (CRPH), a group of former lawmakers from the last elected parliament, condemned the attack and said its timing “only serves to further highlight the long-standing crimes committed by the military coup.”
“We strongly condemn the inhumane actions of the murderous military junta that is trying to gain legitimacy through a sham election. This action only serves to further highlight the long-standing crimes committed by the military coup,” the group wrote on X.
In a related development, ethnic clashes have deepened Myanmar’s humanitarian crisis as the country remains locked in conflict nearly four years after the February 2021 military coup.
The takeover removed the elected government led by Aung San Suu Kyi’s National League for Democracy and extended more than four years of emergency rule.
Meanwhile, the military in July announced a nominal handover of authority to a civilian-led interim administration ahead of elections planned for December and January, although the junta chief remains acting president.