President Barack Obama has vowed that the US will go after the killers of American journalist James Foley, but said rooting out the Islamic State "cancer" would not be easy.
He said: "America does not forget, our reach is long, we are patient, justice will be done."
He added that he would do whatever is necessary to go after those who harm Americans, at a convention of the American Legion in Charlotte, North Carolina.
He added: "Rooting out a cancer like ISIL won't be easy and it won't be quick," referring to an acronym the United States uses for the Islamic State.
Kurdish Peshmerga fighters have emerged victorious in the battle for Mosul Dam, but the question is - what will their next move be?
An ITV News team at Mosul Dam was with victorious Kurdish Peshmerga fighters at the complex earlier today.
ITV News joined a Kurdish unit fighting Islamist militants near Irbil and found them using tanks from the 1950s and short on ammunition.