The multi-day events unfold under a fragile ceasefire between Tehran and Washington, following a preliminary agreement signed in June to halt their active conflict.

Khamenei’s body will lie in state at Tehran’s Grand Mosalla for three days starting Friday.

His remains rest alongside family members who were also killed in the February U.S. and Israeli strikes.

Officials estimate the funeral processions could draw up to 20 million mourners from across the country, according to AFP.

An official funeral ceremony is scheduled in the capital on Saturday. In anticipation of the crowds, authorities have ordered all public and private offices in Tehran to close from Saturday through Monday.

Severe traffic restrictions will completely shut down most of the city center to private vehicles. Additionally, the airspace over Tehran will be partially closed starting Friday and fully grounded on Monday.

Following the Tehran ceremonies, the former supreme leader’s body will be transported to the Iraqi holy cities of Najaf and Karbala for further services.

Khamenei will be taken to his hometown of Mashhad for final burial next Thursday.

Dignitaries and representatives from multiple countries are expected to attend the ceremonies, including Pakistan's Prime Minister Shehbaz Sharif.

Khamenei has been succeeded by his son, Mojtaba, who has not yet been seen in public since assuming the role of supreme leader.