The Telegraph reported on the threat but would not identify British citizen David Cawthorne Haynes:
Just as Mr Sotloff appeared as the next potential victim at the end of the Foley video, a British hostage is shown on his knees as the latest video draws to a close.
A Briton will be the next hostage murdered by Islamist terrorists, the British extremist known as “Jihadi John” threatened on Tuesday as he beheaded a second American journalist and announced “I’m back”.
The Islamic State of Iraq and the Levant (Isil) carried out its threat to murder Steven Sotloff, the US citizen who was shown last month in the video of the murder of his fellow American, James Foley.
Just as Mr Sotloff appeared as the next potential victim at the end of the Foley video, the British hostage, wearing a Guantánamo Bay-style jumpsuit, is shown on his knees as the latest video draws to a close.
In a clear message to David Cameron, the British terrorist says: “We take this opportunity to warn those governments that enter this evil alliance of America against the Islamic State to back off and leave our people alone.”
The killer does not refer to the Briton by name, but his name is shown on screen as a signal of Isil’s intent that he is the next intended victim.
David Cawthorne Haynes was kidnapped in early 2013. He At the time of his abduction he was working for an aid group in Syria.