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TRIGG COUNTY, Ky. (WKRN) — Nine people were killed in a crash involving two Army Black Hawk medical evacuation helicopters conducting a nighttime training exercise in Kentucky, Army officials said Thursday.

Nondice Thurman, a spokesperson for Fort Campbell, said Thursday morning that the deaths happened the previous night in southwestern Kentucky during a routine training mission.

The two HH-60 Black Hawk helicopters, part of the 101st Airborne Division, crashed around 10 p.m. Wednesday in Trigg County, Kentucky. The 101st Airborne confirmed the crash happened about 30 miles (48 kilometers) northwest of Fort Campbell.

According to police, the debris field is sizable. Troopers and other first responders had to secure a large area for the search.

The helicopters landed in a field near a residential area with no injuries on the ground, said Brig. Gen. John Lubas, the 101st Airborne deputy commander.

Speaking at a news conference Thursday morning, Kentucky Gov. Andy Beshear said the state would do everything it can to support the families of those killed.

“We’re going to do what we always do. We’re going to wrap our arms around these families, and we’re going to be there with them, not just for the days, but the weeks and the months and the years to come,” Beshear said.

Lubas said it is unclear what caused the crash. He said a team of investigators from Fort Rucker in Alabama was headed to the crash site.

“This was a training progression, and specifically they were flying a multi-ship formation, two ships, under night vision goggles at night,” Lubas said.

He said officials believe the accident occurred when “they were doing flying, not deliberate medical evacuation drills.”

The helicopters have something similar to the black boxes on passenger planes, which records the performance of aircraft in flight and are used by investigators to analyze crashes.

“We’re hopeful that will provide quite a bit of information of what occurred,” Lubas said.

The Black Hawk helicopter is a critical workhorse for the U.S. Army, used in security, transport, medical evacuations, search and rescue and other missions. The helicopters are known to many people from the 2001 movie “Black Hawk Down,” which is about a violent battle in Somalia eight years earlier.

Black Hawks were a frequent sight in the skies over Iraq and Afghanistan during the wars conducting combat missions and are also used by the Army’s 160th Special Operations Aviation Regiment. They were also often used to ferry visiting senior leaders to headquarters locations in the Iraq and Afghanistan war zones.

Fort Campbell is located near the Tennessee border, about 60 miles (97 kilometers) northwest of Nashville, and the crash occurred in the Trigg County, Kentucky, community of Cadiz.

Nick Tomaszewski, who lives about a mile from where the crash occurred, said he saw two helicopters flying over his house moments before the crash.

“For whatever reason, last night, my wife and I were sitting there looking out on the back deck, and I said, ‘Wow, those two helicopters look low and they look kind of close to one another tonight,’” he said.

The helicopters flew over and looped back around and moments later “we saw what looked like a firework went off in the sky.”

“All of the lights in their helicopter went out. It was like they just poofed … and then we saw a huge glow like a fireball,” Tomaszewski said.

Flyovers for training exercises happen almost daily, and the helicopters typically fly low but not so close together, he said.

“There were two back to back. We typically see one and then see another one a few minutes later, and we just saw two of them flying together last night,” he said.

In the Kentucky House and in the Senate, members stood for a moment of silence Thursday morning in honor of the crash victims. Kentucky state Rep. Walker Thomas said the crash occurred about 15 to 20 minutes from his home.

“They’re there to protect us,” Thomas said. “And we’re constantly seeing these helicopters flying over our communities.”

Thomas spoke about how connected Fort Campbell soldiers and their families are to the communities near the Army post.

“The Fort Campbell soldiers that live in our communities, go to our churches … they go to our schools, their kids do,” he added. “And this really hurts.”

Last month, two Tennessee National Guard pilots were killed when their Black Hawk helicopter crashed along an Alabama highway during a training exercise.

The Associated Press contributed to this report.