U.K.'s David Cameron condemns ISIS beheading: 'We must take action…and find those responsible'

British Prime Minister David Cameron spoke on Saturday about the murder of British aid worker Alan Henning at the hands of ISIS, calling the videotaped beheading "absolutely appalling," and vowing that the United Kingdom would take retaliatory action, The Guardian reports.

"It is senseless. It is completely unforgivable," Cameron said. "Anyone in any doubt about this organization can now see how truly repulsive it is and barbaric it is. This is going to be our struggle now, that with others we must do everything we can to defeat this organization. We must take action against it and we must find those responsible."

ISIS released a video on Friday night showing a man who said he was Alan Henning, and that his imminent murder was in response to Britain's decision to join other countries in deploying airstrikes against ISIS militants and their holdings in Iraq. At the end of the video, an ISIS fighter threatens to kill a fifth hostage, an American he identifies as Peter Edward Kassig.

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