Militants from the extremist Islamist group have taken over large parts of Iraq and Syria as it attempts to set up a caliphate.
Hundreds of thousands of Christians have been forced to flee their homes in the face of convert or die warnings from the jihadists.
At international talks in London, Foreign Secretary Philip Hammond said the campaign to defeat IS would be stepped up.
US Secretary of State John Kerry added that 12 new Iraqi army brigades will be started whilst training camps for Syrian opposition fighters will be built in Saudi Arabia, Turkey and Qatar.
But Mr Hammond warned it could be months before Iraqi troops could effectively tackle IS.
Already coalition forces led by America have been launching air strikes on the militants.
After the meeting the Foreign Secretary said: "We all confirmed our commitment to the struggle however long it takes and wherever it leads us to defeating the scourge of violent Islamist extremism.
"Turkey is doing a fantastic job of intercepting people who are seeking to get across the border into Syria.
"The final bit of the jigsaw is to make sure that we have all the powers necessary, both at national level and in European Union law in terms of passenger name record data to make sure that we can intercept these people and keep the country as safe as we can."
John Kerry said the military effort was "not going to be deterred or diminished or defeated".