Yangon: An explosion this morning rocked the office of a government-backed social welfare group whose members have been accused in attacks against Myanmar’s pro-democracy opposition, witnesses said.

The witnesses, who spoke on condition of anonymity, said the blast occurred at the office of Union Solidarity and Development Association (USDA) in the northern Yangon suburb of Shwepyithar. No casualties were reported.

The government has not blamed any group for the bombing.