Russia accused Ukraine on Sunday of launching drone attacks that sparked a fire at a nuclear power plant in its western Kursk region overnight.

Russian officials said several power and energy facilities were targeted. The fire at the nuclear facility was quickly extinguished with no injuries reported. While the attack damaged a transformer, radiation levels remained within normal ranges.

The United Nations’ nuclear watchdog said it was aware of media reports that a transformer at the plants had caught fire “due to military activity”. A blaze was also reported at the port of Ust-Luga in Russia’s Leningrad region, home to a major fuel export terminal.