"The Islamic State has carried out its threat... It has executed Japanese hostage Haruna Yukawa after the expiry of the deadline given," the Sunni extremist group said on Al-Bayan radio, which broadcasts in areas under its control in Iraq and Syria.
"The second hostage (Kenji Goto) is calling on his relatives to put pressure on the (Japanese) government for the release of our sister Sajida al-Rishawi, held in the jails of the oppressors in Jordan, in exchange for his release," it said.
Her name emerged yesterday in a video released by the Islamic State that shows images of Goto holding what appears to be a photograph of the slain body of his compatriot Yukawa.
The video was released with an audio recording in which a man claiming to be Goto blames Japanese Prime Minister Shinzo Abe for his fellow captive's death because he failed to pay IS a USD 200 million ransom by the end of the 72-hour deadline it announced Tuesday.
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The Amman bombings were claimed by Abu Musab al-Zarqawi, the Al-Qaeda leader in Iraq who was killed in a US air raid there in June 2006.
His group was a precursor of the IS, and Rishawi's brother, Samir Atruss al-Rishawi, who was also killed in Iraq, was one of Zarqawi's lieutenants.
Earlier today, Japan's prime minister Abe branded the murder of Yukawa, a self-employed security contractor, as "outrageous and unforgivable" and demanded IS to immediately release Goto, a freelance journalist.