US President Barack Obama has condemned the murder of American journalist James Foley, saying "no just God" would stand for it.
Obama said the Islamic State, which is believed to have carried out the killing, would "fail" in their mission because they only want to destroy, while the US would "continue to do what we must do to protect our people".
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.