WASHINGTON (CNN) -- U.S. President Barack Obama said Thursday he'd authorized targeted airstrikes in Iraq to protect American personnel.
"We do whatever is necessary to protect our people. We support our allies when they're in danger," Obama said.
Obama also said he'd authorized targeted airstrikes "if necessary" to help forces in Iraq fighting to protect civilians trapped in the mountains as brutal Islamist fighters advance.
"When we have the unique capabilities to help avert a massacre, then I believe the United States of America cannot turn a blind eye," Obama said.
U.S. drops humanitarian aid in Iraq
The United States has airdropped meals and water in Iraq, sending aid to minority groups trapped as brutal Islamist fighters advance.
"The mission was conducted by a number of U.S. military aircraft under the direction of U.S. Central Command," a senior U.S. defense official said. "The aircraft that dropped the humanitarian supplies have now safely exited the immediate airspace over the drop area."
And U.S. President Barack Obama -- scheduled to give a statement on Iraq at 9:30 p.m. ET Thursday -- is weighing a key question: Should airstrikes be next?
Why is the United States sending aid and considering airstrikes?
Rapid developments on the ground, where a humanitarian crisis is emerging with minority groups facing possible slaughter by Sunni Muslim extremists, have set the stage for an increasingly dire situation.
"The latest news just might meet the threshold for action," a U.S. official told CNN.
Thousands of families from the Yazidi minority are reportedly trapped in the mountains without food, water or medical care after fleeing the rampaging fighters of the Islamic State, also known as Islamic State of Iraq and Syria or ISIS.
Throngs of refugees, many of them Iraqi Christians, are on the run -- their largest city now occupied by fighters who gave them an ultimatum, "Convert to Islam or die."
Defense officials say the airstrikes the President and his national security team are weighing would be primarily to protect American consular staff and military advisers working with the Iraqi military in Irbil, the largest city in Iraq's Kurdish region.
The United States is also concerned that ISIS could make a move against the several dozen U.S. military advisers there, a Pentagon official said.
U.S. officials were tight-lipped about their plans Thursday, but a Pentagon official stressed that any reports that the United States had conducted airstrikes in Iraq were "completely false."
Asked about the possibility of U.S. airstrikes, a top Iraqi diplomat said it had been discussed.
"There is some communication between Baghdad and Washington on that issue, but no strike has been done yet," said Mohammad Ali Al-Hakim, Iraq's Ambassador to the United Nations.
A potential escalation of U.S. military involvement comes two years after Obama ended the Iraq war and brought home American forces.
White House spokesman Josh Earnest told reporters Thursday that any potential U.S. action in Iraq would be limited, with no chance of ground troops heading back.
He said the principle for taking a military step would be threats to core American interests or U.S. personnel in Iraq.
Refusing to offer details on what options were being considered, Earnest described the current situation in Iraq as "disturbing," with "innocent populations persecuted just because of their ethnic identity."
Iraqi forces fight back as Islamists advance
The Iraqi air force bombed a number of targets Thursday night, Qubad Talabani, deputy prime minister of the Kurdish Regional Government, told CNN. The strikes killed at least two ISIS emirs, he said.
Talabani also reported that U.S. officials said humanitarian airdrops would take place for the tens of thousands of Yazidis he estimates are stranded without food or water.
The United States has been sharing intelligence through reconnaissance but are not involved in any airstrikes, a senior Iraqi military official told CNN on Thursday.
The ISIS fighters, armed with armored vehicles and other military hardware taken from Iraqi forces in a lightning sweep through the north earlier this year, have overrun Iraq's largest Christian town and nearby villages.
When radical Islamist fighters stormed the northern Iraqi town of Sinjar over the weekend, the Yazidi minority who call it home fled into the surrounding mountains in fear of their lives.
Now, trapped without food, water or medical care in the summer heat, thousands are in desperate need of help. It's already too late to save dozens of children who've died of thirst.
Other groups targeted by ISIS, which seeks to establish a Sunni caliphate stretching from Syria to Baghdad, include Shiite Muslim, Turkmen and Shabak -- all religious minorities.
Fleeing people, some in cars and trucks and others on foot, got out with whatever possessions. The United Nations estimates 200,000 people heading toward Kurdistan in the past 48 hours.
After an emergency meeting on the situation Thursday, the United Nations Security Council issued a statement condemning the Islamists' attacks.
"The members of the Security Council reiterate that widespread or systematic attacks directed against any civilian populations because of their ethnic background, political grounds, religion or belief may constitute a crime against humanity, for which those responsible must be held accountable," the statement said
The council called on the international community to support Iraq "and to do all it can to help alleviate the suffering of the population affected by the current conflict."
Outside Irbil, the internal refugees were sleeping in parking lots or shells of buildings under construction with little access to water or any other services, CNN's Ivan Watson reported.
Kurdish officials call for U.S. or NATO airstrikes to help them fight the ISIS forces.
They also issued statements intended to boost morale of the Kurdish people, saying the Kurdish Pershmerga fighters would be able to hold off any serious threat to Erbil and other cities.
A senior State Department official said the United States also was weighing opening a humanitarian corridor to provide support to Kurdish and Iraqi forces.
Earnest, however, said while the United States would support Iraqi and Kurdish efforts, "we can't solve these problems for them. These problems can only be solved with Iraqi political solutions."
The United States has 245 military personnel in Iraq, 90 of whom are advisers. The carrier USS George H.W. Bush and other Navy ships also are in the region.
Yazidis, among Iraq's smallest minorities, are of Kurdish descent, and their religion is considered a pre-Islamic sect that draws from Christianity, Judaism and Zoroastrianism.
Most of the 500,000 or so members live in and around Sinjar in northwestern Nineveh province, bordering Iraq's Kurdish region.
The U.N. children's agency, UNICEF, said Tuesday that official reports indicated 40 children from the Yazidi minority had died "as a direct consequence of violence, displacement and dehydration" since the weekend.
"Families who fled the area are in immediate need of urgent assistance, including up to 25,000 children who are now stranded in mountains surrounding Sinjar and are in dire need of humanitarian aid including drinking water and sanitation services," it said.