The threat facing Ukraine’s Zaporizhzhia nuclear power plant continues to mount as it was struck at least five times Thursday in a series of missile strikes.

It remains unclear who was responsible for the strikes and both Ukraine and Russia have pointed the blame on one another. 

The United Nations nuclear watchdog, the International Atomic Energy Agency (IAEA), said in a U.N. Security Council meeting late Thursday that this is a "grave hour" for not only Ukraine’s security but Europe’s.

Rafael Mariano

International Atomic Energy Agency Director General Rafael Mariano Grossi reacts during an interview to The Associated Press, in Abu Dhabi, United Arab Emirates, Tuesday, Dec. 14, 2021. Grossi,  (AP Photo/Kamran Jebreili)

ZELENSKYY ACCUSES RUSSIA OF 'NUCLEAR TERROR' AS TROOPS FIRE AT ZAPORIZHZHIA NUCLEAR POWER PLANT

Officials have warned that as the largest nuclear power plant on the European continent and among the largest in the world, the consequences of damaging the Zaporizhzhia nuclear power plant could be "catastrophic." 

"Any military action jeopardizing nuclear safety, nuclear security, must stop immediately," IAEA Director General Rafael Mariano Grossi said. "These military actions near to such a large nuclear facility could lead to very serious consequences." 

Since shelling began on Aug. 5, explosions have reportedly damaged communication lines, radiation monitoring sensors, nitrogen-oxygen station, hydrogen pipelines and other parts of the plant's infrastructure. 

Areas near where the plant’s radioactive materials are stored have also come under threat warned Ukraine's nuclear power agency Energoatom, according to Reuters. 

Grossi told the U.N. Security Council that he did not believe there was an "immediate threat" to the plant's nuclear safety but warned "that could change at any moment."

U.N. Secretary-General António Guterres has called for the complete demilitarization of the nuclear site. 

Russian guardsman at Zaporizhzhia

A Russian serviceman stands guard the territory outside the second reactor of the Zaporizhzhia Nuclear Power Station in Energodar on May 1, 2022.  (Photo by ANDREY BORODULIN/AFP via Getty Images)

RUSSIAN OFFICIALS INSIST AIR BASE EXPLOSIONS 'ACCIDENTAL,' SATELLITE IMAGES SHOW NEAR-IDENTICAL CRATERS

The plant has been under the control of Russian troops since March, but its operations continue to be monitored and carried out by Ukrainian officials.

The Russian delegation on Thursday blamed Ukrainian forces of launching heavy artillery against the site during a shift change and pointed to Kyiv’s refusal to sign onto a trilateral agreement with IAEA.

Ukrainian officials have said that some 500 Russian soldiers have been posted at the nuclear site as a sort of "nuclear shield" as Moscow knows Ukraine will be hesitant to launch an attack in the direction of the nuclear plant.

Ukrainian President Volodymyr Zelenskyy warned Thursday during a defense meeting with world officials in Denmark that the fallout cause from damage to the Zaporizhzhia nuclear plant could be worse than Chernobyl. 

Power plant in Zaporizhzhia

Six power units generate 40-42 billion kWh of electricity making the Zaporizhzhia Nuclear Power Plant the largest nuclear power plant not only in Ukraine, but also in Europe, Enerhodar, Zaporizhzhia Region, southeastern Ukraine, July 9, 2019. Ukrinform.  (Photo credit should read Dmytro Smolyenko/Future Publishing via Getty Images)

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"Only the complete withdrawal of Russians from the territory of the Zaporizhzhia nuclear power plant and the restoration of Ukraine's full control over the situation around the plant will guarantee the restoration of nuclear safety for all of Europe," Zelenskyy said in his nightly address.

"This is a global interest, not just a Ukrainian need," he added.