The Defence Secretary has said that efforts were continuing to determine the location of the two British hostages being held by Islamic State militants.
Michael Fallon said he prayed that journalist John Cantlie and aid worker Alan Henning were still alive, but added: "We can't allow the fate of any hostages, American or British, to derail the overall response to ISIL - we have to tackle ISIL."
Mr Fallon said the the jihadist group posed a direct threat to the security of Britain and other European nations.
IS released a video of Mr Cantlie on Thursday, in which he says he was captured in Syria in 2012.
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