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The UN's atomic watchdog urged Russian forces to stop attacking a Ukrainian nuclear power plant on Friday, warning of "severe danger" if the reactors were hit.

"IAEA Director General @RafaelMGrossi speaks with #Ukraine PM Denys Shmygal and with Ukrainian nuclear regulator and operator about serious situation at #Zaporizhzhia Nuclear Power Plant, appeals for halt of use of force and warns of severe danger if reactors hit," the International Atomic Energy Agency tweeted.