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Mourners in black began gathering Tuesday for days of funerals and processions for Iran's late president, foreign minister and others killed in a helicopter crash, a government-led series of ceremonies aimed at both honoring the dead and projecting strength in an unsettled Middle East.

For Iran's Shia theocracy, mass demonstrations have been crucial since millions thronged the streets of Tehran to welcome Grand Ayatollah Ruhollah Khomeini in 1979 during the Islamic Revolution. An estimated 1 million turned out in 2020 for processions for the late Revolutionary Guard Gen. Qassem Soleimani, who was slain in a US drone strike in Baghdad.

Whether President Ebrahim Raisi, Foreign Minister Hossein Amirabdollahian and others draw the same crowd remains in question, particularly as Raisi died in a helicopter crash, won his office in the lowest-turnout election in the country's history and presided over sweeping crackdowns on all dissent.

Prosecutors already have warned people over showing any public signs of celebrating his death and a heavy security force presence has been seen on the streets of Tehran since the crash.

But Raisi, 63, had been discussed as a possible successor for Iran's supreme leader, the 85-year-old Ayatollah Ali Khamenei. His death now throws that selection into question, particularly as there is no heir-apparent cleric for the presidency ahead of planned June 28 elections.

"Raisi’s death comes at a moment when the Islamist regime is consolidated," wrote Alex Vatanka, an Iran expert at the Middle East Institute. "In short, there will be no power vacuum in Tehran; nonetheless, post-Khamenei Iran suddenly looks far less predictable than it did just a few days ago."

A procession Tuesday morning led by a semi-truck carrying the caskets of the dead slowly moved through the narrow streets of downtown Tabriz, the closest major city near the site of the crash Sunday. Thousands in black slowly walked beside the coffins, some throwing flowers up to them as an emcee wept through a loudspeaker for men he described as martyrs.

The bodies will travel on to the holy Shia seminary city of Qom before traveling to Tehran later Tuesday. On Wednesday, a funeral presided over by Khamenei will then turn into a procession as well. On Thursday, Raisi's hometown of Birjand will see a procession, followed by a funeral and burial at the Imam Reza shrine in the holy city of Mashhad, the only imam of the Shia's faith buried in Iran.

With heavy hearts, the people of Tabriz bid farewell to the beloved president of Iran and his companions.

— Imam Reza Shrine (@ImamRezaEN)

That shrine has long been a center for pilgrims and sees millions visit each year. Over the centuries, its grounds have served as the final burial site for heroes in Persian history. It's an incredibly high, rare honor in the faith. Iranian President Mohammad-Ali Rajai, the only other president to die in office when he was killed in a 1981 bombing, was buried in Tehran.

Iran's theocracy declared five days of mourning, encouraging people to attend the public mourning sessions. Typically, government employees and schoolchildren attend such events en masse, while others take part out of patriotism, curiosity or to witness historic events.

Across Iran, its rural population often more closely embraces the Shia faith and the government. However, Tehran has long held a far different view of Raisi and his government's policies as mass protests have roiled the capital for years.

The most recent involved the 2022 death of Mahsa Amini, a woman detained over her allegedly loose headscarf, or hijab. The months-long security crackdown that followed the demonstrations killed more than 500 people and saw over 22,000 detained. In March, a United Nations investigative panel found that Iran was responsible for the "physical violence" that led to Amini’s death.

On Sunday night, as news of the helicopter crash circulated, some offered anti-government chants in the night. Fireworks could be seen in some parts of the capital, though Sunday also marked a remembrance for Imam Reza, which can see them set off as well. Critical messages and dark jokes over the crash also circulated online.

Iran's top prosecutor has already issued an order demanding cases be filed against those "publishing false content, lies and insults" against Raisi and others killed in the crash, according to the semiofficial ISNA news agency.

Meanwhile Tuesday, Iran’s new Assembly of Experts opened its first session after an election that decided the new assembly, a panel of which both Raisi and the late Tabriz Friday leader Mohammad Ali Ale-Heshem were members. Flowers sat on the seats they would have occupied at the meeting of the 88-member panel, which is tasked with selecting the country's next supreme leader.