David Cameron has reiterated his commitment not to send British troops to Iraq to combat the threat of Islamist extremists.
"Britain is not going to get involved in another war in Iraq," the prime minister told the BBC.
Mr Cameron said Kurdish forces were the "first line of defence" against Islamic State (IS) fighters, ruling out sending British "boots on the ground".
But he said the UK would continue "using the assets that we do have" as a "front-rank power".
Defence Secretary Michael Fallon said the UK's involvement in Iraq had moved beyond a humanitarian one, with British aircrafts gathering surveillance intelligence on IS militants.
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She told reporters: "I don't think it's fully sunk in how really bad that could have been, I know it's not the right decision."