Ukrainians put out fire at nuclear complex after Russian attack

A fire that broke out in a training building near the largest nuclear power plant in Europe during intense fighting between Russian and Ukrainian forces has been extinguished, Ukraine's state emergency service said on Friday, Reuters reports. 

US Energy Secretary Jennifer Granholm said there was no indication of elevated radiation levels at the Zaporizhzhia plant, which provides more than a fifth of total electricity generated in Ukraine.

Earlier, a video feed from the plant verified by Reuters showed shelling and smoke rising near a five-storey building at the plant compound.

The footage shot at night showed one building aflame, and a volley of incoming shells, before a large candescent ball lit up the sky, exploding beside a car park and sending smoke billowing across the compound. It was not immediately clear who was in control of the plant.

"Europeans, please wake up. Tell your politicians – Russian troops are shooting at a nuclear power plant in Ukraine," Ukrainian leader Volodymyr Zelenskiy said in a video address.

Zelenskiy said Russian tanks had shot at the nuclear reactor plants, though there was no evidence cited that they had been hit.

The mayor of the nearby town of Energodar about 550 km (342 miles) southeast of Kyiv said fierce fighting and "continuous enemy shelling" had caused casualties in the area, without providing details.

Thousands of people are believed to have been killed or wounded and more than 1 million refugees have fled Ukraine since Russian President Vladimir Putin last Thursday launched the biggest attack on a European state since World War Two.

Early reports of the incident at the power plant sent financial markets in Asia spiralling, with stocks tumbling and oil prices surging further.

"Markets are worried about nuclear fallout. The risk is that there is a miscalculation or over-reaction and the war prolongs," said Vasu Menon, executive director of investment strategy at OCBC Bank.

Russia has already captured the defunct Chernobyl plant, about 100 km north of Kyiv, which spewed radioactive waste over much of Europe when it melted down in 1986. The Zaporizhzhia plant is a different and safer type, some analysts said.

US President Joe Biden and UK Prime Minister Boris Johnson both spoke with Zelenskiy to get an update on the situation at the plant.

"President Biden joined President Zelenskiy in urging Russia to cease its military activities in the area and allow firefighters and emergency responders to access the site," the White House said.

Johnson said Russian forces must immediately quit their attack and agreed with Zelenskiy that a ceasefire was crucial.

"The prime minister said the reckless actions of President Putin could now directly threaten the safety of all of Europe," Downing Street said.

Energy Secretary Granholm said on Twitter the reactors at Zaporizhzhia were "protected by robust containment structures" and were being "safely shut down"