Millions of mourners have flooded the streets of Tehran to participate in a multi-day memorial for Ayatollah Ali Khamenei, Iran’s former Supreme Leader. Khamenei was killed in the initial attacks of a recently erupted war, prompting widespread grief and a massive outpouring of national mourning. The extensive memorial underscores the significant influence and position the late leader held within Iran. NBC’s Richard Engel is reporting from the scene, detailing the scale of the event and the emotional impact on the population. The outpouring of grief demonstrates the deep respect and loyalty many Iranians held for Khamenei. This period of mourning is expected to continue for several days as tributes are paid to the former Supreme Leader.