Russian forces have been accused of 'nuclear terrorism' after they reportedly bombed a reactor site in Kharkiv.
After continuous shelling in the city, the fire was said to have occurred at the city's Institute of Physics and Technology. Footage shared on Twitter shows explosions sparking huge fires in the air.
Emergency services later said they were tackling a fire near the Kharkiv Institute of Physics and Technology, CNN reports.
According to reports, the fire was at a dormitory near the institute and that the cause of the fire was uncertain.
However, Ukraine's Centre for Strategic Communications and Information tweeted that an 'eyewitness' saw the incident unfold.
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They tweeted: 'In Kharkiv, eyewitnesses report a fire in the building of Kharkiv Institute of Physics and Technology.
'The building contains equipment which, if damaged, can lead to radioactive pollution of the environment. #StopRussia.'
The fire is said to have started at around 8.20pm local time, with residents saying they could hear 'sounds of explosions and volleys of artillery'.
Ukraine's State Nuclear Regulatory Inspectorate has since accused Russia of committing 'an act of nuclear terrorism'.
Fortunately, according to the president's office, so far there has not been any change in the level of background radiation, The Sun reports.
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UK Prime Minister Boris Johnson is concerned of Russia's potential to use chemical weapons in Ukraine.
Talking to Sky News yesterday, on March 10, he said: 'The stuff that you're hearing about chemical weapons is straight out of their playbook.
'They start saying that there are chemical weapons that have been stored by their opponents or by the Americans.
'And so, when they themselves deploy chemical weapons, as I fear they may, they have a sort of maskirovka - a fake story - ready to go.
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'You've seen it in Syria. You saw it even in the UK. That's what they're already doing. It is a cynical, barbaric government.'
Johnson continued: 'I think [Putin] needs to understand that he's made a disastrous miscalculation and that everybody can see that things aren't progressing in the way that he hoped.
'His best bet, I think, is to withdraw, to cease the violence and to allow a peaceful negotiation to begin.'
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He reiterated that Putin, ‘needs to understand that his options are not good’ and that he has ‘made it very difficult to find an offer.’
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Anish Vij