Ukraine’s regional state administration said on Friday that Russian military forces have seized the Zaporizhzhia nuclear power plant – Europe’s largest – in Ukraine’s southeast.

“Operational personnel are monitoring the condition of power units,” it said on social media, quoting the Ukrainian nuclear inspectorate.

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It said efforts sought to ensure the operations were in line with safety requirements.

In its report, Reuters said that Russian forces attacked the plant in the early hours of Friday, setting an adjacent five-story training facility on fire.

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On Thursday, US Energy Secretary Jennifer Granholm said the reactors at Zaporizhzhia power station “are protected by robust containment structures and reactors are being safely shut down”.

Granholm said on Twitter she had spoken with Ukraine’s energy minister about the situation at the plant. She said there were no elevated radiation readings near the facility.

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Ukrainian emergency services said one of six nuclear power units was working as of early Friday.

After the fire broke out, Ukrainian President Volodymyr Zelensky accused Moscow of resorting to “nuclear terror” and sought help from United States’ President Joe Biden and United Kingdom PM Boris Johnson. Following which, Biden urged Moscow to allow emergency responders, including firefighters, enter the nuclear powerplant and bring the fire under control.

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The 44-year-old president said, “If there is an explosion – that’s the end for everyone. The end for Europe. The evacuation of Europe. Only urgent action by Europe can stop the Russian troops. Do not allow the death of Europe from a catastrophe at a nuclear power station.”