Iran's Supreme Leader Ayatollah Ali Khamenei led funeral prayers for the deceased, which also includes foreign minister Hossein Amir-Abdollahian. "Oh Allah, we didn't see anything but good from him," said Khamenei, reciting Islamic funeral verses.

According an Al Jazeera correspondent who is present at 'Freedom Square' where memorial events are taking place, "The streets are completely closed to the traffic, [with] heavy security measures here, several security checkpoints, and you can see thousands and thousands of people are already pouring into this area."

Other cities also hosted memorial processions. The Associated Press details of the Khamenei-led prayers in Tehran:

He soon left and the crowd inside rushed to the front, reaching out to touch the coffins. Iran's acting president, Mohammad Mokhber, stood nearby and openly wept during the service.

People then carried the coffins out on their shoulders, with chants outside of "Death to America!" They loaded them onto a semitruck-trailer for a procession through downtown Tehran to Azadi Square, or Freedom Square, where Raisi gave speeches in the past.

Delegations and foreign ministers from various countries were in attendance, including Turkey's vice president and even Taliban representatives, but among the more notable and controversial figures included Hamas's political leader Ismail Haniyeh.

"I come in the name of the Palestinian people, in the name of the resistance factions of Gaza … to express our condolences," Haniyeh told the crowds.