Zaporizhzhia nuclear plant on emergency power - IAEA

STORY: "Each time we are rolling a dice. And if we allow this to continue time after time then one day our luck will run out," Grossi told the IAEA's 35-nation Board of Governors.

The diesel generators are a last line of defense to keep cooling reactor fuel and prevent a potentially catastrophic meltdown.

As in previous attacks, Russia and Ukraine blamed each other. Grossi has been trying to get both sides to strike a deal in which they would pledge not to fire at or from the plant and heavy weapons would be removed, diplomats say.