Mojtaba Khamenei was named as Iran's new supreme leader on 8 March.
He’s the successor to his father, Ayatollah Ali Khamenei, who was killed on the first day of the war with the US and Iran, on 28 February.
Since his appointment, he has not been spotted on state TV, and his message was read aloud by the presenter.
Mojtaba is the second son of Ali Khamenei and, although he had long been regarded as one of the frontrunners to succeed him, he has kept a low profile and has been seen as exercising influence from behind the scenes.
In addition to his father, Mojtaba Khamenei’s mother and wife were also killed in the US-Israeli strikes.
Iran's state TV news channel has referred to him as a “veteran of the Ramadan war”, without giving any further confirmation as to whether he has been injured.
Reuters has reported that he was “lightly injured”, according to an unnamed Iranian official.
