Explosions rock Kyiv as Russian assault continues

Four major explosions have lit up the night sky in Kyiv, captured by witnesses on video.

It is unclear what the targets of the attack were, or whether there were casualties.

It comes as Russia intensifies its attacks on key Ukrainian cities - with fighting raging for a seventh day in the north, east and south.

The United Nations says one million refugees have now fled Ukraine to neighbouring countries.

The International Criminal Court opens an investigation into potential war crimes by Russia in Ukraine.

Hundreds of people are feared dead in the southern port of Mariupol following hours of sustained shelling, city's deputy mayor says.