On Saturday, a Russian missile struck a residential section in a southern Ukrainian town near a nuclear power station, injuring 12 residents and heightening worries of a nuclear disaster amid Ukraine’s war, according to Ukrainian officials.

Vitaliy Kim, governor of the Mykolaiv region, stated on Telegram that four children were among those injured in an incident in Voznesensk that destroyed multiple private dwellings and a five-story apartment complex.

The village is around 30 kilometers (19 miles) from the Pivdennoukrainsk Nuclear Power Plant (PNPP), Ukraine’s second biggest.

The Mykolaiv region’s general prosecutor’s office updated an earlier toll, saying 12 civilians had been injured.

The attack on Voznesensk was branded as “another act of Russian nuclear terrorism” by the state-run Energoatom, which runs all four Ukrainian nuclear power plants.

On Saturday, air attack warnings were issued many times in the Mykolaiv area.

Russia did not immediately respond to the accusation. Reuters was unable immediately to verify the situation in Voznesensk. There were no reports of any damage to the Pivdennoukrainsk plant.

Ukrainian authorities have called on the United Nations and other international organizations to force Russian forces to leave another nuclear power station which has been occupied since soon after Russia invaded Ukraine on Feb. 24.