, May 22 -- Tehran, May 22 Iranian spiritual leader Ayatollah Seyed Ali Khamenei on Wednesday led the funeral prayers of late Iranian President Ebrahim Raisi, Foreign Minister Hossein Amir-Abdollahian, and six others killed in a chopper crash.In a funeral service at the University of Tehran on Wednesday, Ayatollah Khamenei led the prayers in front of the coffins of President Raisi and seven others who were killed in a helicopter crash on May 19.A huge crowd of people from all walks of life have attended the funeral service in the University of Tehran.Mourners then marched in procession to the Azadi (Liberty) Square.A host of foreign heads of state and authorities have travelled to Iran to pay tribute to Iranian President Raisi and his ent...