The body of Iran's slain Supreme Leader Ayatollah Ali Khamenei was lying in state in a vast hall in Tehran on Friday, as clerics, officials, foreign dignitaries, and mourners paid their respects after his 37-year rule. Khamenei was killed in February by U.S. and Israeli airstrikes at the start of a four-month war, prompting a week of mass funeral processions across Iran and Iraq. His coffin, along with those of family members killed with him, was unveiled to a throng of sobbing supporters, with flowers thrown from the bier into the crowd. The funeral comes at a critical moment for Iran, where the clerical rulers, backed by the Islamic Revolutionary Guard Corps, are riding high from surviving what they saw as an existential war. However, the Islamic Republic is internally fractured, with support for the clerical leadership described as "paper thin" by analysts. Years of crippling sanctions have paralyzed the economy, and mass nationwide protests have been suppressed with increasing force, culminating in the killing of thousands of demonstrators in January. Despite these deep problems, the authorities have mounted a display of state power and mass support, mobilizing millions of mourners for the funeral. Tehran streets were tightly controlled, with military and police vehicles lining major roads. Iran warned the United States and Israel against any attacks during the funeral. Representatives from Russia, China, Iraq, Armenia, and Pakistan attended, along with families of Hezbollah leaders. Khamenei's body will be taken to Qom, Najaf, and Kerbala before being laid to rest in Mashhad on Thursday.