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Residents were warned not to leave their homes as Russian forces launched an air strike on a chemical plant in the Ukrainian city of Chevrolet-Donetsk.
Much of the industrial city of Chevrolet-Donetsk was captured by Russian forces.
A container filled with nitric acid exploded during an attack by Russian forces on a chemical plant there.
People are advised to dip their clothes in water mixed with baking soda, dry them and use them as masks as inhaling nitric acid gas can be dangerous.