Russian shelling has caused a huge fire at a chemical plant in Ukraine's Severodonetsk city where "non-stop" fighting rages, the regional head says.

Serhiy Haidai told Ukrainian TV that Saturday's blaze started after a leak of tens of tonnes of oil from damaged radiators at the Azot plant.

Hundreds of civilians are reportedly sheltering at the plant.

Severodonetsk has become the focal point of Russia's efforts to advance in eastern Ukraine.

Ukrainian officials have also said their army is running out of ammunition as it engages in intense artillery battles with invading Russian forces.

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