The US-led coalition said Tuesday it had killed the Islamic State group's self-proclaimed top cleric in a May air strike on the Syrian town of Mayadeen near the Iraqi border.

"Coalition forces killed Turki Bin'ali, the self-proclaimed 'Grand Mufti' or chief cleric of ISIS in an airstrike May 31 in Mayadeen, Syria," the coalition said in a statement, using an acronym for the jihadist group.