Ayatollah Ali Khamenei, who ruled Iran as supreme leader for over three decades, died at age 86 following a joint military operation by Israel and the United States.
Iranian reports also claimed that four members of his family and two senior commanders were killed, although full details have not been independently verified.
Iran state television announced a 40-day mourning period and seven public holidays following the death of Supreme Leader Ayatollah Ali Khamenei, who had been in power since 1989.
"With the martyrdom of the supreme leader, his path and mission neither will be lost nor will be forgotten; on the other hand, they will be pursued with greater vigour and zeal," a presenter said.
Iranian state media announced Khamenei's death early on Sunday. A senior Israeli official told Reuters earlier that the Iranian leader's body had been found after a strike and US President Donald Trump said the United States worked closely with Israel to target the man who led Iran since 1989.
