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The White House on Friday (October 3) said it was aware of a video purporting to show the beheading of British hostage Alan Henning by Islamic State militants and is evaluating it, a U.S. official said.
If proved real, it is "another demonstration of the brutality" of Islamic State militants, Lisa Monaco, Assistant to the President for Homeland Security and Counterterrorism, told a White House news briefing.
Islamic State militants fighting in Iraq and Syria released a video on Friday which purported to show the beheading of a man identified as British citizen Alan Henning.
Reuters could not immediately verify the footage on YouTube, to which pro-Islamic State Twitter feeds provided links.
Two U.S. journalists, James Foley and Steven Sotloff, have previously been executed by Islamic State, as well as a British aid worker, David Haines.
