Russian shelling causes a huge fire at the Azot plant in Severodonetsk, a Ukrainian official says.
Severodonetsk - the easternmost city still in Ukrainian hands - has for weeks been under heavy Russian shelling
Fighting has lasted more than three months. Russia's early attempt to capture major cities including the capital Kyiv faltered and is now instead trying to capture the Luhansk and the Donetsk regions - a vast mostly industrial area collectively known as Donbas. Ukrainian officials estimate that as many as 800 civilians are hiding in underground bomb shelters at the Azot plant.
"So, when we push the enemy out of one street, they start using their tanks and artillery to destroy the area house-by-house," the Luhansk regional head said.
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