Kyiv and Moscow traded blame on Sunday after a fire broke out at a cooling tower of the Zaporizhzhia nuclear power plant (ZNPP).

Ukraine, Russia and the International Atomic Energy Agency (IAEA) said there had been no detected spike in radiation levels or any impact on nuclear safety.

"IAEA experts witnessed strong dark smoke coming from ZNPP's northern area following multiple explosions heard in the evening," the UN agency said in a post on X, formerly Twitter. It said the plant had reported to them an "alleged drone attack today on one of the cooling towers".