Military personnel of the US Army's 101st Airborne Division take off with a Black Hawk helicopter during a demonstration drill at Mihail Kogalniceanu Airbase near Constanta, Romania on July 30, 2022. (PHOTO / AFP)

The governor of Kentucky said on Thursday fatalities were expected after two US Army Black Hawk helicopters crashed during a routine training mission over the state late on Wednesday.

The status of the crew members was not immediately known, the US Army's Fort Campbell said in a statement to Reuters, without providing the number of people who were on board.

Crew members were flying two HH-60 Black Hawk helicopters, operated by the 101st Airborne Division, which crashed at around 10:00 pm ET (0200 GMT Thursday) in Kentucky's Trigg County

ALSO READ: 4 killed after military-contracted helicopter crashes in US Hawaii

"We’ve got some tough news out of Fort Campbell, with early reports of a helicopter crash, and fatalities are expected," governor Andy Beshear said in a post on Twitter, adding that local authorities and emergency services were responding to the accident.

Crew members were flying two HH-60 Black Hawk helicopters, operated by the 101st Airborne Division, which crashed at around 10:00 pm ET (0200 GMT Thursday) in Kentucky's Trigg County, Fort Campbell's public affairs office said.

"The command is currently focused on caring for the service members and their families," the statement said, adding that the cause of the crash was under investigation.

READ MORE: US Navy helicopter crashes off San Diego coast, 5 missing

The HH-60 is a variant of the Black Hawk helicopter designed to provide support for various military operations, including air assaults and medical evacuations, according to the Army.