The U.S. announced Wednesday that it was talking to several countries including Canada about helping Yazidis, Iraqi Christians, and other people who have become displaced by the advance of Islamist fighters.
At a White House briefing, deputy national security adviser Ben Rhodes said the U.S. was taking up offers to help those who are under threat from the al-Qaida splinter group, the Islamic State of Iraq and the Levant.
"We have offers of support from a number of allies like France, Australia, Canada," Rhodes said.
"We'll be in discussions with them about what they can do both as it relates to helping the Yazidi population ... but also, more broadly, helping bring relief to the displaced persons in northern Iraq, which includes not just Yazidis but an enormous number of Iraqi Christians and others who have been driven from their homes by ISIL."
Later Wednesday, the U.S. dialed down expectations it would launch a rescue mission.
Defence Secretary Chuck Hagel said that there were far fewer refugees stranded on Iraq's Sinjar Mountain and that it's far less likely that the U.S. will undertake a rescue mission there.
Hagel said airdrops of food and water had sustained the refugees and that airstrikes on militants had allowed many of them to escape the mountain.
U.S. officials said an assessment team has determined that only several thousand Iraqi refugees remain on the mountain. Tens of thousands had been reported there last week.
The U.S. had stepped up its Iraqi engagement in recent days, after thousands became stranded on the mountain, facing starvation and the threat of being killed by Islamist rebels.
It has also vowed to fight off rebel incursions that threaten areas where there are Americans — notably Baghdad and the oil-rich Kurdish region, which has a considerable U.S. business and diplomatic presence.
It's expected that several countries will play a humanitarian-assistance role.
Last weekend, Canada promised $5 million in aid for displaced Iraqis, with nearly half the money going to international groups like the Red Cross and the rest set to be spent following consultation with allies.
The Canadian government wouldn't confirm that additional assistance might be forthcoming but one senior official said Wednesday: "I expect that we will be in a position to announce next steps soon."
Meanwhile, British Prime Minister David Cameron cut short his holiday to attend an emergency meeting on Iraq. He promised to help "get these people off that mountain." The Royal Air Force has already provided several drops of humanitarian supplies, and additional British jets and helicopters are being deployed to the region.
France announced it would start supplying "sophisticated" arms to the Kurdish forces fighting Sunni extremists.
Rhodes was adamant about one thing: U.S. President Barack Obama, who removed U.S. combat troops from Iraq three years ago, would not be sending them back in. The president has repeatedly promised not to send in combat troops, and has spoken publicly about his concerns about so-called mission creep.
"In any effort, there are always dangers involved," Rhodes noted when asked whether a rescue mission could devolve into a firefight.
"Well, look, any time you have — I mean, even now as we speak we have pilots flying over Iraq. That always carries with it danger," he said.
So far, U.S. lawmakers have been extremely supportive of the Obama administration's operations in Iraq.
That's a stark contrast with last year, when his musings about airstrikes in Syria met with a wall of resistance.
Polls suggest American public opinion has become anti-war in recent years, following deadly and costly years-long conflicts in Afghanistan and Iraq. Obama was elected on a promise to end the latter war, and has repeatedly stated his reluctance to get drawn back into Iraq.
In the latest airstrike Wednesday, U.S. military officials said a drone aircraft attacked and destroyed an armed truck operated by Islamic militants near Mount Sinjar.
The U.S. Central Command said in a brief statement that the targeted truck was located in the vicinity of a checkpoint operated by fighters of the Islamic State.
-With files from Murray BrewsterSuggest a correction