A new video has been released showing another British man believed to be held hostage by Islamic State militants.
In the video, the hostage - understood to be a journalist - speaks to the camera.
The IS group has previously killed three Western hostages - a Briton and two Americans - and has threatened the life of UK aid convoy volunteer Alan Henning.
The footage is filmed against a dark background, unlike the videos of the beheadings, which have shown hostages against desert backgrounds.
The captive said: "I am a prisoner...but seeing as I've been abandoned by my government and my fate now lies in the hands of the Islamic State, I have nothing to lose."
"Maybe I will live, maybe I will die. But I want to take this opportunity to convey some facts that you can verify. Facts that if you contemplate might help preserving lives."
"Over the next few programmes I am going to show you the truth as the western media tries to drag the public back to the abyss of another war with the Islamic State."
"After two disastrous and hugely unpopular wars in Afghanistan and Iraq, why is it our governments appear so keen to get involved in yet another unwinnable conflict" he added.
Referring to the militants holding the hostage, security expert Pauline Neville-Jones said "It sounds like an extremely cynical plot on their part."
