As the hunt continues for the extremist who murdered journalist James Foley, there is a renewed urgency on preventing the radicalisation of young British Muslims.
The on-screen beheading by the apparently British jihadist has cast a new light on the 500 Britons believed to have travelled to Syria and Iraq to fight with terrorist groups.
ITV News Political Correspondent Carl Dinnen reports:
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.