Dr MaxThere are no signs of violence in the video but in the first of these messages Mr Cantlie made clear he was speaking as a prisoner whose life was in danger.

At the end of the five-and-a-half minute film he indicates there will be further messages.

The video comments on Mr Obama's speech: "It was all disappointingly predictable; America is good, the Islamic State is bad; and they will be defeated using aircraft and a motley collection of fighters on the ground. For their part the Islamic State say they welcome meeting Obama's under-construction army."
John Cantlie Mr Cantlie as he appears in the video

The experienced journalist and photographer has twice been held captive in Syria.

He was kidnapped in July 2012, and handcuffed and blindfolded for a week, but escaped with the help from the Free Syrian Army.周向榮

A second kidnap happened when he returned to Syria towards the end of 2012.
Aid mission

Islamic State - also known as Isis or Isil - has taken control of large areas of Syria and Iraq and declared a caliphate.

Since August, IS has filmed and posted online the deaths of three Western hostages who were beheaded.

They were US journalists James Foley and Steven Sotloff and British aid worker David Haines.

In the video showing the killing of Mr Haines the militants threatened to kill British hostage Alan Henning.

Mr Henning, a taxi driver from Eccles in Salford, was seized while on an aid mission to Syria in December.

Meanwhile, two British Tornado jets have returned to RAF Akrotiri in Cyprus after carrying out a fifth combat sortie over Iraq.

The first jets to take part in a mission against IS carried out armed reconnaissance at the weekend.回收