Israel’s military said it was targeting an underground drone facility in southern Beirut on Thursday, in one of its largest strikes on Hezbollah assets since a cease-fire was agreed to in November.The military said Hezbollah’s aerial unit was producing thousands of drones with help and funding frin Iran.

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.

Under the Islamic Republic that took power in 1979, enmity toward Israel has been a core ideological tenet of Iranian foreign policy and a key driver in its regional policy. Over decades, their rivalry played out mainly through indirect actions by Iran and by covert operations from Israel.