Watch This | Israeli official confirms attacks on Iran

The latest tit-for-tat exchange between the two arch-foes, whose decades-long shadow war has burst out into the open and threatened to drag the region deeper into conflict, saw Israel conduct an attack on Iranian soil on Friday, some Israeli officials confirmed.

Iranian media reported explosions, but an Iranian official said those were caused by air defense systems. State media said three drones over the central city of Isfahan had been shot down.

Israel's leadership and the military were silent early on Friday. Iran has no plan to strike back immediately, a senior Iranian official said, while state media had an initially subdued response to the attack.

The United States received notification before Israel's attack, a source familiar with the situation said, which came days after Iran launched an unprecedented strike, opens new tab on Israel with a barrage of drones and missiles. Most of those were shot down.

According to CNN, a senior U.S. official said Israel notified the U.S. of its intention to retaliate against Iran in the coming days. The official said the U.S. does not support such action.