Two US Army Black Hawk helicopters crashed over Kentucky during a training operation.

Army spokeswoman Nondice Thurman said in a statement on Thursday that the crew members' status was not immediately known. It was unknown how many passengers were on board.

The governor of Kentucky, Andy Beshear, stated that fatalities were likely and that the state's police and emergency management service were reacting.

"We've got some tough news out of Fort Campbell with early reports of a helicopter crash, and fatalities are expected," he tweeted.

Thurman stated that two Black Hawk helicopters crashed on Thursday at around 10 p.m. (02:00 GMT) in Trigg County, Kentucky.

The cause of the accident is being investigated. "The command is currently focused on caring for the service members and their families," she stated.