There had been a swirl of reports about the fate of the supreme leader ever since Saturday morning, when it was clear that his residence had been targeted in the first wave of strikes.

By early evening, the Israeli Prime Minister Benjamin Netanyahu, in a televised address, announced that "there are many signs" that the Supreme leader "is no longer".

These are fateful moments in the turbulent history of the Islamic Republic of Iran - but its most powerful clerics and commanders have been preparing for it.

Minds were concentrated during the 12-day war last June.

On the first night alone, in the first wave of attacks, Israel was able to assassinate nine nuclear scientists, and a number of security chiefs.

And in the days that followed, more senior scientists and at least 30 leading commanders were killed.

It was reported then that Khamenei, who spent the war in his special bunker, was drawing up lists of security officials who could immediately step into place to avoid any vacuum in the top echelons.

And even before last year's hostilities, it was reported that Khamenei had instructed the Assembly of Experts, the body of some 88 senior clerics tasked with choosing a supreme leader, to be ready for every eventuality.

The New York Times reported that he had chosen "three senior clerics" as possible replacements if he were to be assassinated.

There has been speculation for many years about who could take his place, including his son Mojtaba.

It is not just the supreme leader who was killed in this first day of air strikes and targeted attacks.

Those who are still in place, or have had to step into more senior roles, will want to send a message to the world that they are still firmly in charge and the succession will be seamless.

But the end of the Ayatollah's 36-year rule will be a jolt to his supporters, most of all his aides and allies in the elite Islamic Revolutionary Guards Corps (IRGC) tasked with defending him and the Islamic revolution at home and beyond.

But the BBC has verified videos showing groups of people celebrating the reports of his demise on the streets of Tehran and Karaj.

Deeply suspicious of the west, especially the United States, and hostile to Israel, Khamenei has ruled with a firm grip, suppressing calls for reform and repeated waves of protests. These last few years of direct military conflict with Israel and America, and growing calls for change from his own people, saw him confronted with his greatest challenges. During our time in Tehran earlier this month, Iran felt like a different country.

The pain and anger over the security crackdown, the worst in its history, which killed many thousands of Iranians, was still raw.

As Khamenei's time at the helm is brought to a sudden end, questions will turn to his successor and whether a change at the top could also signal a shift in direction for the 47-year-old Islamic republic

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