Renewed shelling has caused a blackout in the city nearest Ukraine's Zaporizhzhia nuclear power plant and could force the plant to shut down, the U.N.'s nuclear watchdog said Friday. The city of Enerhodar, where most of the facility's staff and families live, is experiencing a complete power blackout, with "no running water, no power, no sewage," Rafael Mariano Grossi, the head of the International Atomic Energy Agency (IAEA), said.