CNN: ISIS Beheads American Abdul-Rahman Kassig
The American was a former Army ranger who moved to Syria to help relief efforts, eventually converting to Islam
US hostage Abdul-Rahman Kassig 'killed by IS' (BBC)
A video posted online claims to show that Islamic State militants have killed the captured US aid worker Abdul-Rahman Kassig.
In the video, a masked militant stands over a severed head which he says is that of Mr Kassig.
The US says it is working to determine the authenticity of the video, which also shows a mass beheading of Syrian troops.
Mr Kassig, also known as Peter, was captured last year.
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