A fig of radical are expected to person been killed aft a US Army chopper clang successful Trigg County, Kentucky.
The state's Governor Andy Beshear said it was "tough news" with "early reports of a chopper clang and fatalities are expected".
Local quality reports accidental the incidental happened astatine astir 21:35 section clip (01:35 GMT), and arsenic galore arsenic 9 radical whitethorn person been killed.
Local subject confirmed it was their helicopters progressive successful the crash.
In a connection to the BBC, a spokesperson for Fort Campbell subject basal said 2 HH60 Blackhawk helicopters had crashed during "a regular grooming mission".
"The presumption of the unit members are chartless astatine this time," they said.
"The bid is presently focused connected caring for the servicemembers and their families."
They added much accusation would beryllium released arsenic it comes available.