King Abdullah II has vowed Jordan will take tough action after hanging two convicted militants in response to the burning alive of one of its pilots by the Islamic State group.
The gruesome murder of airman Maaz al-Kassasbeh triggered international condemnation and prompted Jordan to execute two Iraqis on death row - female would-be suicide bomber Sajida al-Rishawi and al-Qaeda operative Ziad al-Karboli.
Abdullah cut short a visit to the United States and flew back to Amman, where he was greeted by large crowds at the airport before meeting with his security chiefs.
"The blood of martyr Maaz al-Kassasbeh will not be in vain and the response of Jordan and its army after what happened to our dear son will be severe," he said afterwards, quoted by the royal court on Wednesday.
Information Minister Mohammad al-Momani said the kingdom was "more determined than ever to fight the terrorist group Daesh," using an Arabic acronym for IS.
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The statements came after Jordan said it hanged Rishawi and Karboli before dawn at a prison south of the capital.
Amman had promised to begin executing Islamic extremists in response to the murder of Kassasbeh, the 26-year-old who was captured by IS when his F-16 fighter plane went down in Syria in December.
The Islamic State group had offered to spare Kassasbeh's life and free Japanese journalist Kenji Goto - who was later beheaded - in exchange for Rishawi's release.
In a highly choreographed 22-minute video released Tuesday, Kassasbeh is seen wearing an orange jumpsuit surrounded by armed and masked jihadists before he appears inside a metal cage apparently soaked in petrol.
One of the jihadists lights a trail of flame that runs into the cage and burns him alive.
The video - the most brutal yet in a series of recorded killings of hostages by IS - prompted global revulsion and vows of unwavering international efforts to combat the Sunni Muslim extremists.
The killing sparked outrage in Jordan and demonstrations in Amman and the city of Karak, the home of Kassasbeh's influential tribe.
