October 2014 handout picture of Peter Kassig
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Kassig killing: Obama condemns IS murder of US hostage

President Barack Obama has described as "pure evil" the killing of US aid worker Abdul-Rahman Kassig, whose beheading was shown in a video posted by Islamic State (IS).

The video, authenticated by the White House, shows a masked man standing over Mr Kassig's severed head. It also shows the beheading of 18 Syrian captives

BBC Security Correspondent Frank Gardner reports.

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