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Two U.S. F/A-18 jet fighters bombed artillery of Sunni Islamic extremists in Iraq on Friday, escalating America’s military involvement more than two years after President Barack Obama brought home forces from the country.

Obama on Thursday authorized “targeted airstrikes” if needed to protect U.S. personnel from fighters with ISIS, which calls itself the Islamic State. The U.S. military also could use airstrikes to prevent what officials warn could be a genocide of minority groups by the ISIS fighters.

Though the United States is supporting Iraq militarily, there won’t be U.S. combat troops on the ground, and it ultimately will be up to the Iraqi government and security forces to resolve the ISIS threat, White House spokesman Josh Earnest told reporters Friday.

“There will not be American troops returning to Iraq in a combat role,” he said, repeating what Obama said in an address Thursday night.

“As commander in chief, I will not allow the United States to be dragged into fighting another war in Iraq,” the President said.

Meanwhile, a senior Kurdish official told CNN that ISIS militants captured Iraq’s largest hydroelectric dam, just north of Mosul, Iraq’s second-largest city. According to the official, the militant fighters have been using U.S.-made weapons seized from the Iraqi army, including M1 Abrams tanks.

There had been conflicting reports about who controlled the dam on the Tigris River, with heavy fighting under way between ISIS fighters and Kurdish forces, known as Peshmerga. U.S. officials have warned that a failure of the dam would catastrophic, resulting in flooding all the way to Baghdad.

In other fighting, an Iraqi airstrike killed 45 ISIS fighters and injured 60 Friday in the northern town of Sinjar, the country’s state-run National Media Center said.

Sinjar is the town that ISIS raided last weekend, causing members of the Yazidi minority there to flee into surrounding mountains without food, water or shelter and prompting concerns of a potential genocide. The Yazidis are of Kurdish descent, and their religion is considered a pre-Islamic sect that draws from Christianity, Judaism and Zoroastrianism.

U.S. flights prohibited

Other signs of a growing regional conflict: The Federal Aviation Administration issued a notice prohibiting U.S. airlines from flying through Iraqi airspace “due to the hazardous situation created by the armed conflict.”

The developments showed that the lightning advance by ISIS fighters across northern Iraq this year has become a battle for the nation’s future and overall stability in a part of the world wracked for decades by periodic war.

French President François Hollande strongly condemned ISIS attacks against the Iraqi population and vulnerable minorities such as Yazidis and Christians and called for the international community to respond.

“France is ready to take its part,” Hollande said in a statement from his office that called for the European Union “to take an active role very quickly” and put in place all the necessary assistance to respond to the crisis.

U.S. warplanes patrolling the skies over northern Iraq have a “green light” to go after perceived ISIS threats to the Kurdish capital, Irbil, or to minority populations, said deputy national security adviser Ben Rhodes.

Airstrikes are also possible to help Kurdish forces end the siege by ISIS in the northern Iraqi mountains, where tens of thousands of Yazidis have sought refuge, Earnest, the White House spokesman, said Friday.

ISIS fighters have surrounded the Yazidis on the ground below.

“If there can be American military might that can tip (the) balance, we’ll look for an opportunity to do that,” Earnest said.

Laser-guided bombs

The first strike involved 500-pound laser-guided bombs on a “mobile artillery piece” used by ISIS at about 6:45 a.m. ET Friday, Pentagon spokesman Rear Adm. John Kirby said.

It came in response to an ISIS advance this week on what officials call U.S. interests in Iraq’s Kurdish region in the north. The militants took towns from the Kurdish Peshmerga.

Before the onslaught, the region had been the most stable in Iraq and a cooperative ally of the United States. U.S. military advisers and consular personnel are stationed in Irbil.

The mobile artillery battery hit Friday was based outside Irbil, Kirby said.

Kurdish pleas

In announcing his airstrike decision Thursday night, Obama said the militants would get hit “should they move towards the city.”

Kurdish leaders have been pleading for the United States or NATO to buttress their forces against ISIS from the air. The President seems to have heard their appeal.

“We do whatever is necessary to protect our people,” Obama said, adding, “We support our allies when they’re in danger.”

Airdrops

Before Obama spoke Thursday night, two U.S. military cargo planes airdropped 5,300 gallons of water and 8,000 meals onto Mount Sinjar, where some Yazidi children had died from dehydration.

The British government said Friday it would support the U.S. humanitarian effort and planned airdrops of its own.

Meanwhile, the United Nations in Iraq was “urgently preparing a humanitarian corridor to allow those in need to flee the areas under threat,” said Nickolay Mladenov, the special representative to the U.N. secretary-general.

He welcomed the “cooperation between the Government of Iraq, the Kurdistan Regional Government and the international community to help prevent genocide and fight terrorism,” according to a U.N. statement.

U.S. Secretary of State John Kerry on Friday repeated the administration’s concerns about genocide.

The militants’ “campaign of terror against the innocent, including the Yazidi and Christian minorities, and its grotesque targeted acts of violence show all the warning signs of genocide,” Kerry said Friday during a televised press conference in Kabul, Afghanistan. “The stakes for Iraq’s future could not be more clear,” and “for anyone who (needs) a wake-up call, this is it.”

Beheadings

ISIS has executed people who don’t share their fanatical interpretation of Sunni Islam and posted videos of their killings to the Internet. “Convert to Islam or die” is the militants’ ultimatum to those captured.

They also have beheaded victims and placed their heads on spikes to strike terror in the population, a senior administration official said.

Already, the Obama administration is rapidly funneling weapons to Iraqi forces. Factories are operating seven days a week to produce them, a senior administration official said.

The administration has pushed for Iraqi Prime Minister Nuri al-Maliki’s Shiite-dominated regime to be replaced by an ethnically more inclusive government

GOP senators want more U.S. action

But two Republican senators said in a statement that the President’s actions do not go far enough. And the United States should not wait on Iraq to pull together before Washington takes action.

Sens. John McCain of Arizona and Lindsey Graham of South Carolina want to see U.S. forces take the fight to ISIS.

“It should include U.S. airstrikes against ISIS leaders, forces, and positions both in Iraq and Syria,” their statement read.

The Iraqi air force bombed a number of ISIS targets on Thursday night, said Qubad Talabani, deputy prime minister of the Kurdish regional government. He told CNN the strikes killed at least two of the group’s emirs.

At this point, the United States has hundreds of military personnel in Iraq, including advisers sent in recent weeks to coordinate with Iraqi and Kurdish military officials in response to the ISIS rampage. The USS George H.W. Bush and other Navy ships also are in the region, and the FA/18s in Friday’s initial strike came from the aircraft carrier.

ISIS fighters have captured armored vehicles and other military hardware from Iraqi forces in a lightning sweep through the north earlier this year.

The militant group’s name, Islamic State, reflects its goal to establish a Sunni caliphate stretching from Syria to Baghdad. After establishing the religious state, the group envisions expanding it throughout the world, and analysts warn of Americans and Europeans with ISIS returning home at some point to bring the battle.

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