Iran's Supreme Leader Ayatollah Ali Khamenei called on Muslims on Saturday "to stand by the people of Lebanon and the proud Hezbollah with whatever means they have and assist them in confronting the ... wicked regime (of Israel)".
Khamenei, in a statement after the Israeli army said it had killed Hezbollah leader Hassan Nasrallah, said: "The fate of this region will be determined by the forces of resistance, with Hezbollah at the forefront", state media reported.
Iranian President Masoud Pezeshkian blamed Nasrallah's killing partly on the United States which has long supplied Israel with advanced weapons.
"The Americans cannot deny their complicity with the Zionists," Pezeshkian said in a statement carried by state media.
Iranian foreign ministry spokesperson Nasser Kanaani vowed in a post on X that Nasrallah's "path will be continued and his holy goal will be realised in the liberation of Jerusalem".
Meanwhile, two regional officials briefed by Tehran told Reuters that Khamenei has been transferred to a secure location inside the country with heightened security measures in place.
The sources said Iran was in constant contact with Lebanon's Hezbollah and other regional proxy groups to determine the next step after the killing of Nasrallah.
