AMMAN, Jordan (AP) — A video released online Tuesday purportedly shows a Jordanian pilot captured by the Islamic State extremist group in Syria last month being burned to death by his captors following a weeklong drama over a possible prisoner exchange.
The video appeared aimed at testing Jordan's continuing participation in the U.S.-led coalition attacking the Islamic State group. Jordan's king, a close Western ally, has portrayed the campaign against the extremists as a battle over values, but the airstrikes against fellow Muslims are not popular in Jordan.
The spokesman for the Jordanian armed forces confirmed the death of the "hero pilot" Lt. Muath al-Kaseasbeh and vowed revenge.
"While the military forces mourn the martyr, they emphasize his blood will not be shed in vain. Our punishment and revenge will be as huge as the loss of the Jordanians," Mamdouh al-Ameri said in a statement read on Jordanian TV.
Al-Kaseasbeh, 26, fell into the hands of the militants in December when his Jordanian F-16 crashed near Raqqa, Syria, the de facto capital of the group's self-styled caliphate. He is the only pilot from the U.S.-led coalition battling the group to have been captured.
At a tribal meeting place where the pilot's relatives have waited for weeks for word on his fate, chants against Jordan's King Abdullah II erupted and some family members wept. An uncle shouted in Arabic: "I received a phone call from the chief of staff saying God bless his soul."
The pilot's father, Safi, was surrounded by family members.
Following militant demands, Jordan's government had said it was willing to trade Sajida al-Rishawi, an al-Qaida prisoner, for the pilot, but that it wanted proof of life first. Al-Rishawi faces death in Jordan for her role in triple 2005 hotel bombings that killed 60 people.
The Associated Press was not immediately able to confirm the authenticity of the video, which was released on militant websites and bore the logo of the extremist group's al-Furqan media service. The 20-minute-long video featured the slick production and graphics used in previous Islamic State videos.
The video included purported images of the pilot showing signs of having been beaten, including a black eye. At the end of the video he is purportedly shown wearing an orange jumpsuit and standing in an outdoor cage. A masked militant lights a line of fuel leading to the cage.
The video also threatened other purported Jordanian pilots.
The latest video emerged three days after Japanese journalist Kenji Goto was purportedly beheaded by the militants. The fate of the two captives had been linked but a video of Goto's purported slaying released Saturday made no mention of the pilot.
An audio message last week, also purportedly from the Islamic State group, said the pilot would be killed if al-Rishawi was not released Thursday, without actually proposing a swap.
A scroll on Jordan TV said that the pilot was killed on Jan. 3, raising questions over whether any of the hostage negotiations were sincere.
U.S. President Barack Obama said if the video is found to be authentic it would be "just one more indication of the viciousness and barbarity of this organization."
"It will redouble the vigilance and determination on the part of the global coalition to make sure that they are degraded and ultimately defeated," he told reporters during an event at the White House.
The Islamic State extremist group, which controls around a third of Syria and neighboring Iraq, has released a series of grisly videos showing the killing of captives, including two American journalists, an American aid worker and two British aid workers. Tuesday's was the first to show a captive being burned alive.
David L. Phillips, a former State Department adviser on the Middle East, said he believes the brutal killing of the pilot could backfire, antagonizing Sunni Muslims against the Islamic State group, including Sunni tribes in Iraq.
"They need to have a welcome from Sunni Arabs in Anbar Province (in Iraq) to maintain their operations," said Phillips, director of the Program on Peace-building and Human Rights at Columbia University.
He said the extremist group's recent military setbacks may have fueled the killings. "They need to compensate for that with increasingly gruesome killings of prisoners," he said.
Jordan has made clear that the hostage crisis will not prompt it to leave the U.S.-led military coalition against the Islamic State group.
On Sunday, a day after a video emerged of the purported beheading of Goto, Jordanian Foreign Minister Nasser Judeh insisted the kingdom remains "as committed as ever" to the coalition.
Experts are divided over whether Jordan faces a greater threat from extremists outside its borders or from those within. In recent months, there have been signs of greater support for the Islamic State group's ideas among Jordan's young and poor. Last year, the government intensified a crackdown on IS sympathizers and the al-Qaida branch in Syria.
Currently, about 220 Jordanians are in prison because of alleged ties to such groups, including 30 who are serving terms from three to five years, said Marwan Shehadeh, an expert on militant groups.