Supreme Leader Ayatollah Ali Khamenei said that Iran and its regional allies will not back down from Israel after an Israeli attack on Beirut that is thought to have targeted the heir apparent to Hezbollah’s slain leader, Reuters reports.

“The resistance in the region will not back down even with the killing of its leaders,” Khamenei said in a rare appearance leading Friday prayers in Tehran, mentioning Nasrallah in his speech and calling its attack on Israel legal and legitimate.

He did not mention Hezbollah official Hashem Safieddine, rumoured to be Nasrallah’s successor. Axios reporter Barak Ravid cited three Israeli officials as saying that Safieddine had been targeted in an underground bunker in Beirut overnight.

Safieddine’s fate was not clear, Ravid said on X.