Islamic State militants have released the video of British hostage John Cantlie to engage in "strategic communications" with Western governments and the Muslim youth in those countries, a terrorism expert has said.
"They are acting as an organisation that has a strategy, and that means that they are an actor that can be influenced, and they calibrate what they do with what we do," Professor John Gearson told ITV News.
"Therefore it's a campaign - it's not merely mindless murderers who kills anyone they can find".
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