Authorities said that at least seven people died and 22 were injured during an explosion at an administration building in Mykolaiv on Tuesday, a southern port city in Ukraine that Russia has unsuccessfully tried to capture.
A spoksperson for the Mykolaiv military regional government, Dimitri Pletienchuk, said the victims were all civilians.
He added that the injured had been taken to hospital with varying injuries.
Rescuers searched the rubble for other missing people as trucks removed debris from the severely damaged building, which is located in the centre of the city.
A gaping hole could be seen in the centre of the building and shattered glass littered the inside and exterior of the structure.
Other buildings around were also affected by the blast.