Toxic fume warning in Ukraine as oil depot hit in Russian invasion

Russian troops have entered Ukraine's second-largest city Kharkiv, say local officials.

A loud explosion was also heard in the city, where a gas pipeline is said to have been hit.

Air raid sirens have gone off in Kyiv, but the centre is relatively calm. However, an oil depot in Vasylkiv to the south of the capital was hit.

The fire prompted fears of toxic fumes and residents were warned to close their windows and stay indoors.