British forces, however, will drop food aid for Iraqi refugees under threat from militants.
Defence secretary Michael Fallon said UK will support US in its planned air strikes on militants with surveillance and refuelling along with food drops, helping members of the Yazidi community trapped on a mountainside.
British Prime Minister David Cameron said he was extremely concerned "by the appalling situation in Iraq and the desperate situation facing hundreds of thousands of Iraqis".
Condemning the barbaric attacks being waged by ISIL terrorists across the region Cameron said he welcomes "President Barack Obama's decision to accept the Iraqi government's request for help and to conduct targeted US air strikes, if necessary, to help Iraqi forces as they fight back against ISIL terrorists to free the civilians trapped on Mount Sinjar. I fully agree with the President that we should stand up for the values we believe in — the right to freedom and dignity, whatever your religious beliefs."
Cameron said he was especially concerned for the minority Yazidi community now trapped on Mount Sinjar, where they have fled for their lives.
"They fear slaughter if they descend back down the slopes but face starvation and dehydration if they remain on the mountain. The world must help them in their hour of desperate need," Cameron said.
UK chaired a meeting of the United Nations Security Council on Friday "to ensure a strong international response to the crisis".
The defence secretary also chaired a COBRA meeting on Iraq.
"I have tasked officials to urgently establish what more we can do to provide help to those affected, including those in grave need of food, water and shelter in the Sinjar area," Cameron added.
After chairing a meeting of COBRA, Fallon said "We are offering aid of our own, which we hope to drop over the next couple of days, in support of the American relief effort, particularly to help the plight of those who are trapped on the mountain."
He added "We welcome what America is doing in particular to bring humanitarian relief and to prevent any further suffering — but our focus is on assisting that humanitarian mission, using our military in support of the Americans in terms of refuelling and surveillance, and add to it with food drops with our own."
A Downing Street spokeswoman said the UK was "not planning a military intervention".
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