Barack Obama, pictured in the White House press briefing room on 18 August
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Barack Obama 'appalled' by IS beheading

US President Barack Obama has said the beheading of US journalist James Foley is "an act of violence that shocks the conscience of the entire world".

Mr Obama said the ideology of Islamic State (IS), the group which made a video of Mr Foley's killing, was "bankrupt" and would ultimately fail.

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