Mourners have gathered in large numbers to pay their respects to Iran's late Supreme Leader Ayatollah Khamenei, with crowds assembling in Mashhad and the funeral procession reportedly crossing into Iraq. The mourning has been ongoing for at least two days, with various forms of tribute being displayed, including the waving of Iranian flags and photographs of the late leader. The scale of the mourning is significant, with estimates ranging from thousands to millions of people participating.