WASHINGTON — U.S. warplanes made a second wave of airstrikes Friday in northern Iraq Friday against the militants who have besieged a religious group and threatened the city of Irbil, the Associated Press reported.

The news service quoted an anonymous official in New Delhi, India, where Defense Secretary Chuck Hagel had been traveling. The attacks followed the first strikes that were announced Friday morning.

The Pentagon said the morning strikes involved two FA-18 fighter-attack planes dropped 500-pound, laser-guided munitions on a mobile artillery place near Irbil, the capital of the Kurdish region.

The jets came from the USS George H.W. Bush, an aircraft carrier operating in the Persian Gulf, according to a Defense Department official who spoke on condition of anonymity to discuss sensitive military details.

President Obama said Thursday night that airstrikes would be used if the militants threatened Irbil, home to a U.S. consulate and a joint U.S.-Iraqi operations center.

"As the president made clear, the United States military will continue to take direct action against ISIL (Islamic State of Iraq and the Levant) when they threaten our personnel and facilities," Rear Adm. John Kirby said in a statement.

White House spokesman Josh Earnest said Friday afternoon he had "no operational update" on air strikes in Iraq, but said Obama's plan is "very limited in scope."

Obama's objectives are "protection of American personnel in Iraq," Earnest said, and answering the "urgent humanitarian situation at Sinjar Mountain," where members of an Iraqi religious minority, the Yazidis, are seeking refuge.

Hundreds of Yazidi women have been taken captive by ISIS members, the spokesman for Iraq's human rights ministry said Friday. Kamil Amin said the women are below the age of 35 and some are being held in schools in Iraq's second largest city, Mosul. He said the ministry learned of the captives from their families.

Earnest said the U.S. mission against ISIS will not involve combat troops and will focus on helping improve Iraq forces so that they can take the lead in the fight against the militants.

The administration had developed the Iraq plan for some time, Earnest said, and that Obama discussed Iraq and ISIS with House and Senate leaders in a mid-June meeting

Obama, congressional leaders and members of key committees also discussed Iraq at a meeting eight days ago, Earnest said. "We certainly welcome the partnership and support" of lawmakers, he said, adding that the White House contacted key leaders Thursday before the announcement of the strikes.

The administration has no plans to seek additional appropriations for the Iraq operation, Earnest said. The administration will maintain congressional consultations, and make notifications as required under the War Powers Resolution, he said.

Earnest said the plan will be evaluated regularly, and assessed based on conditions on the ground.

"The president has not laid out a specific end date," Earnest said.

Obama has been briefed by national security aides throughout the day, Earnest said. In the morning, he spoke on the telephone with Jordan's King Abdullah, a longtime U.S. ally.

There are about 650 U.S. troops in Iraq — 470 of them to protect American personnel and property at the embassy and Baghdad International Airport. The remainder are there to assess the security situation in Iraq and assist Iraqi forces in dealing with the threat from Islamic extremists who have captured key cities.

The Pentagon also has dispatched Apache attack helicopters and surveillance aircraft to the airport. The drones and other manned spy planes have been flying dozens of missions daily.

Meanwhile, the Federal Aviation Administration announced Friday that it is banning U.S. airlines and commercial carriers from flying in Iraqi airspace.

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