David Cameron has stressed that the UK "is not going get involved in another Iraq war" following the release of a video showing the murder of journalist James Foley.
"We are not putting combat troops, combat boots on the ground - that is not something we should do," he said.
The Prime Minister said the Government has "a clear strategy" on Iraq and that it will "stick to that strategy."
"This [is a] struggle against Islamist extremism - not a struggle of one religion against another - it's of all people and all religions, including Islam, against a poisonous extremism.," Cameron added.
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.