The State Department could not confirm the claim by the terrorist group.
While one source denies the king's involvement, others believe he will participate in the fighting against the terrorist group.
The killing was intended to frighten off neighboring leaders—but may have hardened their resolve.
Jordan has executed Iraqi militant Sajida al-Rishawi and a senior al Qaeda prisoner in retaliation for the murder of captured Jordanian pilot, a security source said Wednesday.
Japanese prime minister Shinzo Abe said every effort was being made to secure the release of Kenji Goto.
Jordan said it would go ahead with a proposed prisoner swap only if one of its pilots captured by Islamic State insurgents was freed.
Jordanian officials reportedly agreed to release prisoner Sajida al-Rishawi to the Islamic State (ISIS) in exchange for Jordanian pilot Muadh al-Kasasbeh.
Winter storms are making life worse for the country's 620,000 registered refugees.
Offers to help destroy the jihadist terrorist group amount to little or nothing.
Jordanian MP admits pro-ISIS activists in the country have grown "stronger" since the pilot's capture
Jordan is one of several Arab countries participating in the U.S.-led military mission to bomb fighters from the Islamist group, which holds territory in both Syria and Iraq.
Foreign governments meet in Berlin on Thursday to discuss funding the humanitarian response to Syria's refugee crisis.
To keep a U.N. food program for Syrian refugees going, $80 million has been raised.
France is to decide whether it will aid Jordan in its fight against ISIS by sending fighter jets to the country
Life has become so intolerable for Syrians living in Jordanian refugee camps that many are desperate to return to their war-torn country of origin
Qatada was cleared of conspiring in a plot to attack tourists, after being extradited from Britain following a lengthy legal battle
A coalition of five Arab nations joined the U.S.
The same militant group attacking Iraq wants a Sharia-based Caliphate with pieces of Jordan