Five explosions were heard in close intervals over three to five minutes near Kyiv's power station to the north of the city, according to Mayor Vitali Klitschko.
"The emergency services are underway. We're finding out the details," he said.
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He added that bridges in the city had been taken under protection and special control, as Russian troops are nearing, while checkpoints are being installed near strategic city objects.
“The situation now – without exaggeration – is threatening for Kyiv. The night, close to the morning, will be very difficult.”
Nearly 200 Ukrainians including 57 civilians have been killed during the Russian invasion of Ukraine, as Putin urged the country’s military to “take power in your hands”.
It comes amid claims that over 18,000 rifles have been handed out to street fighters in Kyiv and civilians were urged to make molotov cocktails to fight off Russian forces.
The toll of Russian President Vladimir Putin's 'special military operation' is already high: Russia has coordinated attacks on 33 civilian sites; hundreds of Ukrainians, both troops and citizens, have died or sustained injuries; and more than 450 Russian troops have also been killed. However, it also noted this was likely an underestimate and the actual death toll could be far higher.
Air raid sirens have been blaring in Kyiv this morning as residents cower from missile attacks, with more than 100,000 bidding to flee the capital amid the conflict. It's believed Russian troops are now just 20 miles from Kyiv, with fears Putin wants to capture the city and kill President Volodymyr Zelensky.
Ukraine has also reported the deaths of 137 people, including civilians and troops. According to the interior ministry, at least two children have been killed as a result of Russia's attacks on residential areas. 'The Russians say they are not striking civilian objects. But 33 civilian sites have been hit over the last 24 hours,' the agency said.
Eleanor Rudd