Supreme Leader of Iran Ayatollah Ali Khamenei has promised vengeance after his top general was killed during a drone strike led by U.S. forces in Baghdad, Iraq, on Thursday.

“With his departure and with God’s power, his work and path will not cease, and severe revenge awaits those criminals who have tainted their filthy hands with his blood and the blood of the other martyrs of last night’s incident,” said a statement released by Khamenei.