Iran announced at dawn Sunday the killing of Ali Khamenei, the Supreme Leader of Iran, in the aftermath of Israeli and American airstrikes on various Iranian regions.The Iranian News Agency (IRNA) reported today that Khamenei was killed in an attack launched by the Israeli military and the United States on Saturday morning, without providing additional details regarding the circumstances of his death.For its part, the Iranian government declared 40 days of national mourning and seven days of official holiday following the formal announcement of the Supreme Leader's death.Earlier yesterday, Iranian media outlets reported the killing of the Supreme Leader's daughter, his son-in-law, and his granddaughter in the Israeli and American strikes.US President Donald Trump announced late Saturday the killing of the Iranian Supreme Leader in an unprecedented attack launched by his country and Israel against Iran.The Israeli entity and the United States launched a large-scale joint attack on Iran since Saturday morning, with explosions reported in the capital Tehran and several other cities, including Qom, Isfahan, Kermanshah, and Karaj. The strikes reportedly targeted air defense systems and missile launch platforms, resulting in more than 200 fatalities and approximately 800 injuries, according to official Iranian sources.Tehran responded by launching a broad wave of missiles toward various areas inside Israel and several countries in the region.