The US National Security Council has confirmed a video released by the Islamic State purporting to show US journalists James Foley and Steven Sotloff is authentic.
The US Intelligence Community has analysed the recently-released video showing US citizens James Foley and Steven Sotloff.
We have reached the judgement that this video is authentic.
We will continue to provide updates as they are available.
A British family have told ITV News of their devastation after discovering a close relative is fighting with the Islamic State in Iraq.
A French journalist who was held hostage with James Foley in Syria has told ITV News it was "devastating" to see his murder.