Tehran’s streets filled with vast crowds of black-clad mourners on Monday as Iran staged an elaborate funeral procession for Supreme Leader Ayatollah Ali Khamenei, killed alongside his family in the US-Israeli airstrike that ignited the war on Iran. The turnout, actively encouraged by the theocracy as a display of strength, unfolded as US President Donald Trump sharpened his ultimatum: strike a permanent ceasefire deal or “finish the job.”

The flag-draped coffins were mounted on a truck decorated to resemble the ornamental grating around an imam’s shrine, with mourners chanting slogans calling for the death of Trump. Revolutionary Guard Gen. Hasan Hasanzsdeh, who is overseeing the ceremonies, said the cortege would travel a 12-hour route through the capital to Mehrabad International Airport, from where the bodies would be flown for burial.

The spectacle coincided with intense US-Iranian negotiations over a permanent end to the conflict that claimed the 86-year-old cleric’s life in the opening February 28 attack. Trump’s warning reinforced the diplomatic pressure on a leadership already seeking to consolidate its authority after the devastating strike.