President Barack Obama and Jordanian King Abdullah II vowed not to let up in the fight against the Islamic State group, as Jordanians mourned the death of a military pilot held captive by the militants. Obama hosted Abdullah at the White House on Tuesday for a hastily arranged meeting, hours after a video emerged online purportedly showing 26-year-old lt Muath Al-Kaseasbeh being burned to death by the militant group. AP Abdullah, who was on a previously scheduled trip to Washington, arrived after nightfall and made no remarks to reporters as he and Obama sat side by side in the Oval Office. In the meeting, Obama offered “his deepest condolences” to the king over the pilot’s death, the White House said.