Millions of mourners flooded the streets of Tehran on Saturday, pressing shoulder to shoulder across boulevards that stretched to the horizon, as Iran buried Supreme Leader Ali Khamenei and four members of his family — all killed when a US-Israeli air strike destroyed his compound on February 28. Aerial footage showed seas of black-clad figures extending far beyond the capital's central squares, with state television broadcasting the ceremonies live to cities from Mashhad to Ahvaz. Security forces lined every rooftop. The air above the crowd was thick with smoke from incense burners and the sound of collective prayer.

The scale of the public mourning has placed acute pressure on both Washington and Tehran at a moment when their diplomatic channel remains, by most accounts, paper-thin. US President Donald Trump moved quickly to manage the temperature, announcing that "neither side will shoot the other during the funeral proceedings" and confirming that negotiations between the two countries would resume once the ceremonies had concluded. The statement, unusual in its bluntness, signalled that back-channel contacts have continued even as Iran's political establishment remains in open disarray following Khamenei's death. That disarray runs deep.

No successor has been publicly confirmed, and Iran's Assembly of Experts — the clerical body responsible for choosing a new Supreme Leader — has convened in emergency session behind closed doors.