Iran’s supreme leader Mojtaba Khamenei was conspicuously absent from his father’s funeral, as senior regime figures joined thousands of people who paid their respects to the late ayatollah on Sunday.

Ali Khamenei’s three other sons, Masoud, Mostafa and Meysam, attended Sunday’s service, along with officials including President Masoud Pezeshkian and Revolutionary Guard chief Ahmad Vahidi.

Speculation about Mojtaba’s condition, fueled by rumors that he was wounded in the same US and Israeli airstrikes that killed his father, has continued as he has not appeared in public since his appointment in early March.

The elder Khamenei ruled the Islamic Republic from 1989 until his death in February.

The official funeral for the late supreme leader began on Friday and events are planned across Iran and Iraq over the next week.

Iranian authorities say between 12 and 20 million people are expected to attend the ceremonies, which they call the “funeral of the century.”

Khamenei’s body currently lies in state at Tehran’s Grand Mosalla religious complex, with a funeral led by prominent Shiite cleric Jafar Sobhani, a 97-year-old scholar who teaches at seminaries in the holy city of Qom.