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(FOX NEWS) The Obama administration said Tuesday that it was working to confirm the authenticity of a newly-released video that purportedly shows the killing of American freelance journalist James Foley by Islamic State militants.

White House National Security Council spokeswoman Caitlin Hayden said the administration has seen the video. She said that if it’s deemed genuine by the intelligence community, the U.S. would be “appalled by the brutal murder of an innocent American journalist.”

Fox News has learned that the video, which is being taken seriously by U.S. officials, is being analyzed by a special group within the US intelligence community that specializes in media exploitation. The group, formerly known as the Islamic State of Iraq and Syria, is believed to have other Americans in their custody.