Iran interred late President Ebrahim Raisi at the holiest Shiite shrine in the nation on Thursday, days after a fatal helicopter crash killed him along with the country’s foreign minister and six others.

Mourners lowered Raisi into a tomb at the Imam Reza Shrine in Mashhad, where Shiite Islam’s eighth imam is buried and millions of pilgrims visit each year. Hundreds of thousands of people dressed in black crowded around the shrine under its iconic golden dome, wailing and beating their chests in sorrow in a sign of mourning common in Shiite ceremonies.