Jordan has confirmed the death of pilot Moaz al-Kasasbeh after a video published online by ISIS claimed to show him being burned alive.
Jordan vowed "punishment and revenge".
ISIS militants released a video on Tuesday purporting to show a captive Jordanian pilot being burned alive in a cage, just days after the militants beheaded a Japanese journalist.
The video comes just days after ISIS' British executioner in chief, Jihadi John, savagely murdered Japanese journalist Kenji Goto in a shocking filmed beheading after days of intensive negotiations through intermediaries to save him.
Yesterday Jordanian government spokesman Momeni said: 'All state organisations have been mobilized to secure the proof of life that we require so that he can be freed and returned to his home.'
'We are still ready to hand over the convict Sajida al-Rishawi in return for the return of our son and our hero,' Mohammad al-Momani added.
Last week Jordan vowed to fast-track the execution of Sajida al-Rishawi if ISIS kills Kasasbeh.
It apparently warned ISIS that she and other jailed ISIS commanders would be 'quickly judged and sentenced' in revenge for the execution of the pilot.