Jordan has warned the Islamic State that it will execute all ISIS members in its custody if the terror group kills a Jordanian pilot it is holding hostage.

The 26 year old F16 pilot, Mu'ath Kasasbeh, was seized by ISIS in December after his plane crashed near its headquarters in the Syrian city of Raqqa.

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The Islamic State has been trying to free its commanders and the would-be suicide bomber Saijda al-Reishawi in exchange for Kasasbeh and remaining Japanese hostage Kenji Goto.

Japan said it was working with Jordan on the prisoner swap but ISIS must first show proof of life for the two hostages.

Intelligence officials believe that ISIS' refusal to prove that Kasasbeh was still alive meant that Jordan's negotiation with the militants is doomed to fail.

Elijah Magnier, reporter for a Kuwait newspaper, said that based on his sources, the Jordanian government has recently sent a message to ISIS, warning that if they kill the pilot, Jordan will impose the death penalty on their ISIS captives immediately.

Magnier said there are many prisoners in Jordan that ISIS would like to free.

Jordan has reportedly agreed to free ISIS member al Rishawi, who failed to execute her mission as a suicide bomber. ISIS, in return, will not kill the Jordanian pilot.

But after the terror group announced an ultimatum on the release of its members from Jordanian prison, Jordan said it was still waiting for proof that the captured Jordanian F16 pilot was still alive.

The deadline had passed yesterday with no one in either camp fulfilling their respective part of the bargain.

An audio message purportedly posted online by ISIS said it will kill the Jordanian pilot if Al Riwashi will not be delivered at the Turkish border yesterday at dusk in Jordanian time.

Reports said Jordan was willing to trade Riwashi for the pilot but until sundown, no prisoner swap was made.

Jordan authorities said they were also negotiating for the release of Japanese journalist, Mr. Goto.

The families of the Jordanian pilot and Mr. Goto waited in agony over the supposed release of their kin, but Japan said their negotiation with the terror group "remains deadlocked" as of Saturday.

"Anything could happen," Japanese Foreign Minister Fumio Kishida told media on Saturday . "We can't predict it at all. While preparing for every situation, I want to make every effort for Mr. Goto's release," he added.

National broadcaster NHK said Prime Minister Shinzo Abe was at his office Saturday standing by for updates on the hostage situation. 

TagsJordan, ISIS, hostaged pilot, Kenji Goto