Jordan’s King Abdullah vowed a “relentless” war against Islamic State on their own territory on Wednesday in response to a video published by the hard-line group showing a captured Jordanian air force pilot being burned alive in a cage.

Jordan hanged two Iraqi jihadists, one a woman, on Wednesday and vowed to intensify military action against Islamic State.

“We are waging this war to protect our faith, our values and human principles and our war for their sake will be relentless and will hit them in their own ground,” state television quoted the king as saying during a security meeting.

US officials said on Wednesday that the United Arab Emirates had withdrawn from flying air strikes in the US-led coalition campaign against Islamic State after the Jordanian pilot’s plane went down over Syria in December.

Jordan, which is part of the US-led alliance, had promised an “earth-shaking response” to the killing of its pilot, Mouath al-Kasaesbeh, who was captured after his F-16 crashed.

Government spokesman Mohammad al-Momani said on Wednesday: “We are talking about a collaborative effort between coalition members to intensify efforts to stop extremism and terrorism to undermine, degrade and eventually finish Daesh.” Daesh is used as a derogatory Arabic term for Islamic State.

He said it was a continuation of Jordan’s long standing policy in fighting hard-line Islamist militants and that King Abdullah, who cut short a trip to the United States, headed a meeting with senior security officials on Wednesday. “All the state’s military and security agencies are developing their options. Jordan’s response will be heard by the world at large but this response on the security and military level will be announced at the appropriate time,” Momani said.

Islamic State had demanded the release of Sajida al-Rishawi in exchange for a Japanese hostage whom it later beheaded. Sentenced to death for her role in a 2005 suicide bomb attack in Amman, Rishawi was executed at dawn. Jordan also executed a senior al Qaeda prisoner, Ziyad Karboli, an Iraqi man who was sentenced to death in 2008.

The Jordanian pilot was the first from the coalition known to have been captured and killed by Islamic State.