Nine soldiers were killed when two U.S. Army Black Hawk helicopters crashed during a training exercise in Kentucky on Wednesday night, officials said Thursday morning.

Iran PressAmerica:   The crash occurred at around 10 p.m. local time (11 p.m. ET) in Trigg County, west of Fort Campbell, the Army base said in a statement early Thursday.2 hours ago

The two HH-60 Black Hawk assault helicopters crashed into each other at about 10 p.m. during a routine training mission in Trigg County, Ky., Nondice L. Thurman, a spokeswoman at the Army base, Fort Campbell, said in a statement. She added that the crash was under investigation.

The helicopters were from the 101st Airborne Division, which is based at Fort Campbell and is the Army’s only air assault division.

Brig. Gen. John Lubas said during a news conference at Fort Campbell on Thursday that the Army did not yet know what had caused the collision, and that there were no radio signals calling for help before it occurred. The helicopters were equipped with flight recorders that officials hoped would be able to help shed light on what happened, he said.

All of the soldiers on board the two helicopters — four on one and five on the other — were killed, General Lubas said. He declined to provide details about any of the soldiers until their families had been notified.

“This is a truly tragic loss for our families, our division, and Fort Campbell,” he said.

Gov. Andy Beshear of Kentucky said during the news conference that it was a tragic day for Kentucky and for Fort Campbell.

“We must remember that freedom relies on those who are willing to serve, some of which pay the ultimate price,” Mr. Beshear said.

A Black Hawk helicopter can transport an 11-person infantry squad, and the HH-60 model can be used for air assaults, medical evacuations, and other purposes, according to the Army.

The weather in the Fort Campbell area at the time of the collision was fair: calm winds, a visibility of 10 miles, and a temperature of 39 degrees.

Fort Campbell sits on 105,000 acres that include parts of Trigg and Christian Counties in Kentucky, and Montgomery and Stewart Counties in Tennessee.

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