Powerful explosions shook the area of Ukraine’s Zaporizhzhya Nuclear Power Plant (ZNPP), “abruptly ending a period of relative calm” at the facility, the head of the UN nuclear watchdog agency said on Sunday.

In a statement issued by the International Atomic Energy Agency (IAEA), Director General Rafael Mariano Grossi said that that blasts yesterday evening and again this morning further underlined “the urgent need for measures to help prevent a nuclear accident there”.

“As I have said many times before, you’re playing with fire!”.

Renewed shelling

In what appeared to be renewed shelling near and at the site of Europe’s largest nuclear power plant, IAEA experts on the ground reported that more than a dozen blasts were heard within a short period of time in the morning local time.

The IAEA team were also able to see some of the explosions from their windows.

“The news from our team yesterday and this morning is extremely disturbing”, said Mr. Grossi.

Citing information provided by plant management, the IAEA team said there had been damage to some buildings, systems, and equipment at the site, but noncritical for nuclear safety and security.

“Explosions occurred at the site of this major nuclear power plant, which is completely unacceptable”, he added. “Whoever is behind this, it must stop immediately”.

According to news reports, Russian and Ukrainian nuclear energy authorities each blamed the other side’s forces for the strikes – triggering fears of a serious nuclear accident. So far, there have been no reports of any radiation leaks at the Russian-occupied plant.

Nuclear-free zone

The IAEA experts said that there were no reported casualties, and they are in close contact with site management.

Meanwhile as they continue to assess and relay updates on the situation, the IAE chief renewed his urgent appeal that both sides of the conflict agree to implement a nuclear safety and security zone around the ZNPP as soon as possible.

In recent months, he has been engaging in intense consultations with Ukraine and Russia on establishing a zone – but, so far, no agreement has been reached.

“I’m not giving up until this zone has become a reality”, said Mr. Grossi. “As the ongoing apparent shelling demonstrates, it is needed more than ever”.