Russian troops are now in control of Europe's largest nuclear power station, according to Ukrainian officials.
Shelling overnight caused a fire to break out at the Zaporizhzhia plant.
The blaze was extinguished and radiation levels are said to be normal.
Ukraine's president says "only urgent action by Europe" will stop the Russian invasion.
Speaking overnight, Volodymyr Zelenskyy said he fears this is the catastrophe that could lead to the continent's "evacuation".
"If there is an explosion then that is the end for everyone," he added.
"The end for Europe, the evacuation of Europe; only urgent action by Europe can stop the Russian troupes.
"Do not allow the death of Europe from a catastrophe at a nuclear power station."