U.S. strikes ISIS artillery in Iraq
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Washington (CNN) - 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 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.

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.

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.