Iran's supreme leader, Ayatollah Ali Khamenei, has vowed to retaliate for the death of Hezbollah leader Hassan Nasrallah, who was killed in an Israeli airstrike in Lebanon.
Khamenei ordered five days of mourning in Iran, calling Nasrallah a symbol of resistance against Israel.
He urged Muslims to support Hezbollah, but didn't specify what kind of action Iran would take.
The incident has heightened tensions between Israel and Iran and raised concerns about the potential for a wider conflict in the Middle East.
