Europe’s biggest nuclear power plant is under attack. Russian-occupied Zaporizhzhia - on the banks of the Dnipro River in southeastern Ukraine - is home to six reactors, supplying energy to roughly four million homes. Explosions at the plant, some within metres of the site's safety and security systems, prompted the head of the UN nuclear watchdog Rafael Grossi to make an urgent appeal for calm. "Whoever’s behind this," he said, "you are playing with fire." Russian state media said 15 shells had been fired at the plant from the Ukrainian side of the Dnipro, but no radioactive emissions had been detected. The warring factions blame each other for the shelling.