President Obama has authorised targeted air strikes against Islamic State fighters in northern Iraq and airdrops of humanitarian supplies to prevent a "potential act of genocide".
Mr Obama said he approved the use of force if necessary to protect American citizens and religious minorities.
He said militants would be targeted if they advance towards the Kurdish capital Irbil, where US officials are based.
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.