01/24/2015 AT 02:20 PM EST  A new video posted online Saturday appears to show one of ISIS's two Japanese hostages saying that his fellow Japanese compatriot had been beheaded and issuing a new ransom demand for his release.  The footage, which was reportedly released by the Islamic State militant group, also known as ISIL or ISIS, shows Japanese journalist Kenji Goto, in handcuffs, holding a photo that purportedly shows the dead body of fellow captive Haruna Yukawa,  "I am Kenji Goto Jogo," the journalist allegedly says in the video. "You have seen the photo of my cellmate Haruna slaughtered in the land of the Islamic Caliphate. You were warned. You were given a deadline, and so my captives acted upon their words."  SITE Organization, which monitors extremist websites, said the video was released to several Islamic State-linked Twitter accounts, according to news reports.  The video could not be independently verified. In a written statement, NSC Deputy Spokesperson Patrick Ventrell said the "intelligence community is working to confirm its authenticity."  "The United States strongly condemns ISIL's actions and we call for the immediate release of all the remaining hostages," he said. "The United States is fully supportive of Japan in this matter. We stand in solidarity with Japan and are coordinating closely."  The Islamic State militant group captured the two Japanese men in Syria last year.  Prior to the Saturday video, ISIS demanded that Japan pay a $200 million ransom within 72 hours for the release of the two men. The deadline for the ransom passed on Friday.  In the video, Goto reportedly said Islamic State had a new ransom plan and was now proposing a prisoner swap between the captured journalist and female suicide bomber Sajida al-Rishawi. Al-Rishawi was arrested in Jordan in 2005 for attempting to attack a hotel as part of a series of planned terrorist attacks.  "They no longer want money, so you don't need to worry about funding terrorists,"  . "They just demand the release of their imprisoned sister Sajida Rishawi.  "It is simple. You give them Sajida, and I will be released ... Again, I would like to stress how easy it is to save my life. You bring them their sister from the Jordanian regime, and I will be released immediately – me for her," he allegedly added.
Intelligence authorities are working to verify a video purportedly showing captive Kenji Goto holding a photo of Haruna Yukawa's dead body