Jordan has vowed to secure the release of pilot Muath al-Kaseasbeh, after Islamic State (Isis) released a video showing the execution of Japanese journalist Kenji Goto.
Mohammed al-Momeni, a government spokesman, told Petra news agency that they are doing "everything it can to save the life and secure the release of its pilot".
He said: "All state organisations have been mobilised to secure the proof of life that we require so that he can be freed and returned to his home."
There is sparse information on the Isis hostage's condition or whereabouts. Lt Muath al-Kaseasbeh, was captured when his plane came down in Syria during December on a mission to support the US-led, anti-IS military coalition.
Jordan said on Friday that it will only release Sajida Mubarak Atrous al-Rishawi, a would-be suicide bomber currently on death row, if it gets proof al-Kaseasbeh is alive.
The spokesman also condemned the murder of Japanese journalist Goto after days of intensive efforts through intermediaries to save him.
"We spared no effort, in coordination with the Japanese government, to save his life," Momeni said.
Lt al-Kaseasbeh's father, Safi al-Kassasbeh, today spoke out in horror at the killing of Goto saying the Jordanian "government is responsible" for his son's fate.
Members of the al-Kaseasbeh tribe held a candlelight vigil in his home town of Karak, Jordan on Saturday, carrying posters with "we are all Mu'adh" written in Arabic.
— Live From Mogadishu (@Daudoo) February 1, 2015
An uncle of the pilot, Yassin Rawashda, said on Sunday that "we want the government to tell us the truth". He says the family also wants to know more about the negotiations between Jordan and Isis.
The government is also under pressure to win the release of Lt al-Kaseasbeh, the first foreign pilot to be captured by Isis since a US-led military coalition began carrying out air strikes in Iraq and Syria in September.
There was no mention of the fate of al-Kaseasbeh, a Jordanian F-16 fighter pilot in last night's footage, and Jordan has previously threatened to kill all of its Islamic State hostages if he is harmed.
Elijah Magnier, chief international correspondent for Kuwait's Al Rai newspaper, told MailOnline: "I have reliable contact in the Jordanian government who says a message has been passed to Isis.
"It warns that if they kill the pilot they will implement the death sentences for Sajida and other Isis prisoners as soon as possible."