Moscow and Kyiv accused each other of starting a fire on the grounds of Europe’s largest and now Russian-occupied Zaporizhzhia nuclear power plant in Ukraine on Sunday (11 August), with both sides reporting no sign of elevated radiation, Paralel.Az reportrs citing Euractiv.

The UN’s International Atomic Energy Agency (IAEA) nuclear watchdog, which has a presence at the vast six-reactor facility, said its experts had seen strong, dark smoke coming from the northern area of the plant in southern Ukraine following multiple explosions.

“These reckless attacks endanger nuclear safety at the plant and increase the risk of a nuclear accident. They must stop now,” IAEA chief Rafael Grossi warned in a separate statement, without attributing blame for the attack.

The fire comes less than a week after Ukraine’s forces launched their largest incursion into Russian territory since the war-start in 2022, a surprise move that has brought conflict into a new phase, after weeks of Moscow’s battlefield gains.

Russian state news agencies, TASS and RIA, cited the country’s nuclear energy company Rosatom as saying the main fire was extinguished shortly before midnight on Sunday.

RIA, citing Rosatom, said a drone attack started the fire at the cooling tower, without providing evidence.

Ukraine’s nuclear power company Energoatom said in a statement on the Telegram messaging app that one of the cooling towers and other equipment were damaged.

Russia’s TASS agency also reported, citing Rosatom’s statement, that a cooling tower was damaged. Citing local Russian emergency ministry representatives, TASS said it was a non-functioning tower.

Grossi said the agency requested “immediate access” to the cooling tower to assess the damage. There was no immediate response from Moscow or Kyiv to Grossi’s statement.

Russia captured the plant from Ukraine shortly after launching its full-scale invasion on its smaller neighbour in 2022, an attack described by Moscow as a “special operation”. The plant’s six nuclear reactors are in cold shutdown.