US President Obama, Jordan's King Abdullah Vow Not to Let Up Against Islamic State

US President Barack Obama and Jordanian King Abdullah II vowed not to let up in the fight against the Islamic State group on Tuesday, as Jordanians mourned the death of a military pilot held captive by the militants.

Mr Obama hosted King Abdullah at the White House for a hastily arranged meeting, hours after a video emerged online purportedly showing 26-year-old Lt. Muath Al-Kaseasbeh burned to death by the militant group. King Abdullah, who was on a previously scheduled trip to Washington, arrived after nightfall and made no remarks to reporters as he and Mr Obama sat side by side in the Oval Office.

In the meeting, Mr Obama offered "his deepest condolences" to the king over the pilot's death, the White House said. "The president and King Abdullah reaffirmed that the vile murder of this brave Jordanian will only serve to steel the international community's resolve to destroy ISIL," said White House spokesman Alistair Baskey, using an acronym for the extremist group.

Lt. Al-Kaseasbeh, who fell into the hands of the militants in December when his Jordanian F-16 crashed in Syria, is the only pilot from the US-led coalition to have been captured to date.

His death sparked outrage in Jordan, where the country's participation in the coalition against the Islamic State group has not been popular. The video emerged following a weeklong drama over a possible prisoner exchange with an Al Qaeda operative imprisoned in Jordan.

In a statement before his meeting with King Abdullah, Mr Obama vowed the pilot's death would "redouble the vigilance and determination on the part of our global coalition to make sure they are degraded and ultimately defeated."

"Lieutenant Al-Kaseasbeh's dedication, courage and service to his country and family represent universal human values that stand in opposition to the cowardice and depravity of ISIL, which has been so broadly rejected around the globe," the US President said.

US Vice-President Joe Biden, who held a previously scheduled lunch with King Abdullah in Washington on Tuesday, also condemned the killings and called for the release of all prisoners held by Islamic State militants. The King also held previously scheduled meetings with US senators.

Jordan, a close US ally, has portrayed the campaign against the extremists as a battle over values.