Japan PM slams 'despicable' Islamist execution threat

In their latest released video, IS threaten to execute a freelance journalist, unless Amman releases a jihadi bomber

An angry Japanese prime minister today slammed as "utterly despicable" an Islamist militant threat to kill both a Japanese hostage and a Jordanian pilot unless Amman releases a jihadi bomber.

The clock was ticking towards the 24-hour deadline Islamic State group militants set in their latest chilling video, which warned they will execute freelance journalist Kenji Goto and airman Maaz al-Kassasbeh if they don't get their way.

"This was an utterly despicable act, and I am appalled," Japanese premier Shinzo Abe told reporters. "While we are in an extremely severe situation... I have instructed all ministers to work together for the early release of Kenji Goto."

"The government, in this extremely severe situation, has been asking for the Jordanian government's cooperation towards the early release of Goto, and this policy remains unchanged," he earlier told ministers.

Tokyo has thrown itself on the mercy of Jordan since a video emerged at the weekend in which the extremist group announced it had murdered Haruna Yukawa, a self-employed contractor it had kidnapped in August.

After initially demanding a $200 million ransom for the release of the two Japanese men, the group, which rules swathes of Syria and Iraq with a medieval form of Islam, said it wanted Jordan to free Sajida al-Rishawi, a would-be suicide bomber who has been on death row since 2006.

Analysts said the changing demands were an attempt to divide close allies of the US-led fight against extremism in the Middle East.

They say the IS group is forcing Jordan, a moderate Muslim country, into the position of trying to balance strong domestic pressure to bring its airman home with wariness of harming its important relationship with deep-pocketed Japan.

Kassasbeh was captured by IS on December 24 after his F-16 jet crashed while on a mission against the jihadists over northern Syria.

In the latest video, Goto, a respected war reporter, is seen holding a photograph of Kassasbeh, while a voiceover, purportedly spoken by the Japanese hostage, warns that Jordan is blocking his release.

The narrator says both captives will be killed within 24 hours if Rishawi is not freed, and urges the Japanese government to put pressure on Jordan.

Moments after the new video appeared, Goto's mother Junko Ishido said: "I think the government should do whatever it can do."

"Kenji does not hold any animosity toward the Islamic State. He went to the Islamic State out of his extreme concern for Yukawa," she told Japanese media.