Seven US service members were killed Thursday in a helicopter crash in western Iraq, a US military official said.

There were no survivors in the crash, the official said, adding that the crew of a second helicopter flying alongside did not report seeing signs of hostile fire when the helicopter went down.

Multiple US defense officials told CNN the aircraft was a HH-60 Pave Hawk helicopter, a Black Hawk variant. They said the helicopter was not on a combat mission at the time.

The US-led coalition fighting ISIS in Syria and Iraq said Thursday that an investigation was underway to determine the cause of the crash.</s>IRAQ — Seven US service members were killed Thursday in a helicopter crash in western Iraq, a US military official said.

There were no survivors in the crash, the official said, adding that the crew of a second helicopter flying alongside did not report seeing signs of hostile fire when the helicopter went down.

Multiple US defense officials told CNN the aircraft was a HH-60 Pave Hawk helicopter, a Black Hawk variant. They said the helicopter was not on a combat mission at the time.

The US-led coalition fighting ISIS in Syria and Iraq said Thursday that an investigation was underway to determine the cause of the crash.</s>Seven US service members were killed Thursday in a helicopter crash in western Iraq, a US military official said.

There were no survivors in the crash, the official said, adding that the crew of a second helicopter flying alongside did not report seeing signs of hostile fire when the helicopter went down.

Multiple US defense officials told CNN the aircraft was a HH-60 Pave Hawk helicopter, a Black Hawk variant. They said the helicopter was not on a combat mission at the time.

The US-led coalition fighting ISIS in Syria and Iraq said Thursday that an investigation was underway to determine the cause of the crash.</s>IRAQ (CNN) — Seven U.S. service members were killed Thursday in a helicopter crash in western Iraq, a U.S. military official said.

There were no survivors in the crash, the official said, adding that the crew of a second helicopter flying alongside did not report seeing signs of hostile fire when the helicopter went down.

Multiple U.S. defense officials told CNN the aircraft was a HH-60 Pave Hawk helicopter, a Black Hawk variant. They said the helicopter was not on a combat mission at the time.

The U.S.-led coalition fighting ISIS in Syria and Iraq said Thursday that an investigation was underway to determine the cause of the crash.</s>Seven U.S. service members were killed Thursday in a helicopter crash in western Iraq, a U.S. military official said.

There were no survivors in the crash, the official said, adding that the crew of a second helicopter flying alongside did not report seeing signs of hostile fire when the helicopter went down.

Multiple U.S. defense officials told CNN the aircraft was an HH-60 Pave Hawk helicopter, a Black Hawk variant. They said the helicopter was not on a combat mission at the time.

The U.S.-led coalition fighting ISIS in Syria and Iraq said Thursday that an investigation was underway to determine the cause of the crash.</s>(CNN) — Seven US service members were killed Thursday in a helicopter crash in western Iraq, a US military official said. There were no survivors in the crash, the official said, adding that the crew of a second helicopter flying alongside did not report seeing signs of hostile fire when the helicopter went down.

Multiple US defense officials told CNN the aircraft was a HH-60 Pave Hawk helicopter, a Black Hawk variant. They said the helicopter was not on a combat mission at the time.

The US-led coalition fighting ISIS in Syria and Iraq said Thursday that an investigation was underway to determine the cause of the crash.</s>Washington (CNN) Seven US service members were killed Thursday in a helicopter crash in western Iraq, the US military said.

Army Brig. Gen. Jonathan P. Braga, the director of operations for the combined task force leading the fight against ISIS in the region, said all personnel aboard the HH-60 Pave Hawk helicopter were killed.

The Defense Department released the names of the seven airmen on Saturday. They are Captain Mark K. Weber, 29, of Colorado Springs, Colorado; Captain Andreas B. O'Keeffe, 37, of Center Moriches, New York; Captain Christopher T. Zanetis, 37, of Long Island City, New York; Master Sergeant Christopher J. Raguso, 39, of Commack, New York; Staff Sergeant Dashan J. Briggs, 30, of Port Jefferson Station, New York; Master Sergeant William R. Posch, 36, of Indialantic, Florida; and Staff Sergeant Carl Enis, 31, of Tallahassee, Florida.

New York Mayor Bill de Blasio announced Friday that two members of the New York Fire Department were among those killed in the crash, later identified as Raguso and Zanetis.

"They are truly two of New York City's bravest -- running into danger to protect and defend others, both in New York City and in combat overseas," de Blasio said. "On behalf of all New Yorkers, I extend my deepest condolences to their families, loved ones, and fellow service members and FDNY members."

Read More</s>The American military helicopter that crashed in Iraq Thursday hit a power line, U.S. officials said today, killing all seven airmen on board.

“This tragedy reminds us of the risks our men and women face every day in service of our nations,” Brig. Gen. Jonathan Braga, director of operations, Combined Joint Task Force-Operation Inherent Resolve, said in a coalition statement.

The HH-60 Pave Hawk crashed after striking a power line, a U.S. official told ABC News, an assessment made by the crew of a U.S. helicopter accompanying the HH-60.

The investigation is ongoing and has not ruled out other factors but there are no signs of hostile fire, officials said.

U.S. Air Force, FILE

The accompanying helicopter also reported the crash, according to the coalition statement, adding that a “quick reaction force comprised of Iraqi Security Forces and Coalition members secured the scene.”

The names of the victims have not been released, pending notification of relatives.

The aircraft went down near al Qaim in western Anbar Province.

It's believed to be the first fatal helicopter crash in Iraq since the U.S. began fighting ISIS there in 2014.

The incident occurs as the U.S. is shifting personnel and resources out of Iraq and into Afghanistan, as the war against ISIS in Iraq has wound down in recent months.

Two Americans have lost their lives in Iraq this year in non-combat related incidents.

There are approximately 5,262 U.S. service members in Iraq, according to the Pentagon.

ABC News' Stephanie Ramos and Steve Turnham contributed to this report.</s>(CNN) — Seven US service members were killed Thursday in a helicopter crash in western Iraq, a US military official said.

There were no survivors in the crash, the official said, adding that the crew of a second helicopter flying alongside did not report seeing signs of hostile fire when the helicopter went down.

Multiple US defense officials told CNN the aircraft was a HH-60 Pave Hawk helicopter, a Black Hawk variant. They said the helicopter was not on a combat mission at the time.

The US-led coalition fighting ISIS in Syria and Iraq said Thursday that an investigation was underway to determine the cause of the crash.</s>Seven US service members were killed Thursday in a helicopter crash in western Iraq, a US military official said.

There were no survivors in the crash, the official said, adding that the crew of a second helicopter flying alongside did not report seeing signs of hostile fire when the helicopter went down.

Multiple US defense officials told CNN the aircraft was a HH-60 Pave Hawk helicopter, a Black Hawk variant. They said the helicopter was not on a combat mission at the time.

The US-led coalition fighting ISIS in Syria and Iraq said Thursday that an investigation was underway to determine the cause of the crash.
A U.S. Air Force HH-60 Pave Hawk helicopter crashes near Al-Qa'im in Iraq's western Al Anbar Governorate, killing all seven people on board.