Moscow and Kiev accused each other on Sunday of starting a fire on the grounds of the Russian-occupied Zaporizhia nuclear power plant, as Ukraine urged residents to remain calm and reported no signs of high radiation levels. The UN's International Atomic Energy Agency (IAEA) nuclear watchdog, which has a presence at the massive six-reactor facility, said its experts had seen heavy, dark smoke coming from the northern sector of the plant in southern Ukraine after several explosions.
