US special forces had tried to rescue hostages in Syria this summer, including James Foley, senior officials in the Obama administration have revealed.
The mission was authorised after intelligence agencies believed they had identified the location where the hostages were being held.
However, the special operations troops who were dropped by aircraft into Syria did not find the hostages, and engaged in a firefight with Islamic State militants before departing.
ITV News' James Mates reports from Washington:
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.