The leader of Lebanon's Hezbollah group said on Monday a missile salvo into the Israeli-occupied Golan Heights last week marked a new phase in the Syrian war and showed Damascus and its allies would not let Israeli attacks in Syria go unanswered.

Israel has said the attack from Syrian territory was carried out by Iran's Revolutionary Guards, which set up Shiite Hezbollah in Lebanon in 1982. Iranian forces and Hezbollah have deployed to Syria in support of President Bashar Assad.

Israel said it had attacked nearly all of Iran's military infrastructure in Syria in response to the attack, which marked the first time Iranian forces have fired at Israeli-held territory. It was the most extensive military exchange ever between the foes.