Iran’s Supreme Leader Ali Khamenei led prayers at the funeral of Sayyed Razi Mousavi, a senior Revolutionary Guards adviser who was killed in what Iran said was an Israeli air strike in Syria, Reuters reports.

Khamenei paid tribute “to this martyr’s tireless struggle and called for his companionship with the guardians of God,” state TV said.

Mourners chanted “Death to America, Death to Israel” during a funeral service for Mousavi at Iraq’s most revered Shi’ite shrine in the city of Najaf on Wednesday.