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Britain's defense chief says the country's efforts in Iraq have moved beyond a strictly humanitarian effort and the mission won't be over any time soon.

Michael Fallon's remarks to Royal Air Force members in Cyprus suggest that reconnaissance actions in Iraq are moving beyond easing the plight of Yazidis and other minority groups fleeing militants.

With critics warning of mission creep, Prime Minister David Cameron told the BBC on Monday that the government has "fully worked through" its strategy, and stressed troops would not get involved in another war. But he argued limited action is needed to prevent violence from being exported to Britain's streets.

"We are not going to be putting boots on the ground." Cameron said. "We are not going to be sending in the British Army."