The Israeli military warned Iranians living near nuclear reactors to evacuate, while Prime Minister Benjamin Netanyahu said the attacks by Israel so far were nothing compared with what Iran would see in the coming days.

Israel and Iran launched fresh attacks on each other late on Saturday, stoking fears of a wider conflict after Israel expanded its surprise campaign against its main rival with a strike on the world's biggest gas field.

Iranian media reported that Israel struck the South Pars Gas Field in what would be the first attack on an Iranian energy site.