Crowds of Iranians marched through the streets of Tehran on Monday in a funeral procession for slain leader Ayatollah Ali Khamenei, the biggest day yet in a week of massive memorial ceremonies demonstrating the grip of surviving clerical leaders.

Drone footage on state television showed many tens of thousands of people crammed into a boulevard in central Tehran. The caskets of the slain leader and four of his family members were driven in a large truck through the streets, while fire hoses sprayed water from above to keep the marchers cool.