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British Prime Minister David Cameron said the U.K. would “hunt down” the ISIS members who beheaded British aid worker David Haines. “Step by step, we must drive back, dismantle, and ultimately destroy ISIL and what it stands for,” he said at Downing Street following an emergency meeting on Sunday. He vowed support for the U.S. fight against the so-called Islamic State, as well as to work with the Iraqi government. “We will not do so on our own, but working with our allies, not just in the United States and in Europe, but also in the region,” he said. However, he did not commit British forces to a major military role. “This is not about British combat troops on the ground,” Cameron said. “It is about working with others to extinguish this terrorist threat.”