“[ISIS leadership] always hide and they are always on the move but we have assets always in the air for an opportunity to target al-Baghdadi and his gang,” he said. “If [al-Baghdadi] is not frightened let him show himself to us and he’ll see what we can do against him.”

The death of pilot Muath al-Kasasbeh, who was burned alive in a cage by ISIS militants, triggered up to 20 sorties per day by Jordanian jets targeting the militant group’s positions in Syria.

Al-Baghdadi’s last known public appearance was at a mosque in Mosul, Iraq, in July 2014 delivering an address in which he declared the establishment of a caliphate, or traditional Islamic government. It is not known where al-Baghdadi is now, and whether he is even in Syria.