He is the son of assassinated Supreme Leader Ayatollah Ali Khamenei.
President Donald Trump announced "major combat operations" against Iran on Feb. 28, with massive joint U.S.-Israel strikes attack targeting military and government sites, officials said.
Iranian state television confirmed that Ayatollah Ali Khamenei was among those killed by airstrikes in Tehran on the first day of strikes. His successor is yet to be named.
Iran is responding to the operation with missile and drone attacks targeting Israel, regional U.S. bases and multiple Gulf nations. Israel is also intensifying its long-running strike campaign against the Iran-backed Hezbollah militia in Lebanon.
(Read previous Iran live updates here.)
Watch special coverage on Nightline, "War with Iran," each night on ABC and streaming on Disney+ and Hulu.
Iranian missiles and drones were targeting the United Arab Emirates on Monday, the country’s Ministry of Defense said.
"UAE air defences are currently responding to incoming missile and drone threats from Iran," the ministry said on social media. "MOD asserts that the sounds heard are the result of the Air Defence."
The State Department on Sunday ordered the evacuation of non-emergency government employees and their families from Saudi Arabia, updating earlier guidance that authorized them to depart due to safety risks. Saudi Arabia remains a Level 3 "Reconsider Travel" country for U.S. citizens.
The U.S. embassy in Saudi Arabia remains operational with core staff in place, according to the State Department.
-ABC News' Chris Boccia
Continued missile and drone strikes were reported across the Middle East in the early hours of Monday morning.
The Qatari Ministry of Defense said that armed forces intercepted a missile attack.
Emergency management in the UAE released a statement saying air defenses were dealing with a missile threat.
The Ministry of Defense in Saudi Arabia said it intercepted and destroyed two drones heading toward the Shaybah field.
The Bahrain Interior Ministry said in a statement that warning sirens were sounding, writing, "citizens and residents are urged to remain calm and head to the nearest safe place."
The Kuwait Army said air defenses were confronting hostile missile and drone attacks.
In a wide-ranging interview with "60 Minutes," Defense Secretary Pete Hegseth said the U.S. mission in Iran was “on track” and that surrender would be achieved by degrading Iran’s military power.
He said the U.S. was not fighting a regime-change war, and that the military mission did not involve ushering a new government into power.
Hegseth said the U.S. would extinguish the nuclear threat posed by Iran, and that the Pentagon has options "to get after" highly enriched uranium that remains in the country.
Speaking of the campaign, Hegseth said, "This is only just the beginning."
-ABC News' Chris Boccia
