The US government says it's working to verify the authenticity of a videotape that appears to show the beheading of American journalist Stephen Sotloff by Islamic State militants.
Mr. Sotloff's family have gathered in Miami where they are reportedly grieving.
Also on the video the group threatens the life of a British hostage.
Our US Correspondent Simon Marks reports.
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British Prime Minister David Cameron has condemned the murder of Mr. Sotloff as "disgusting".
Our London Correspondent Olly Barratt says pressure is mounting on Mr. Cameron's government to identify the British-accented killer of Mr. Sotloff and James Foley.
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