Nine people have died after two US Army helicopters crashed on Wednesday night in the state of Kentucky, US media report.

The incident involved the 101st Airborne Division and happened during a training mission near a military base.

The state's governor, Andy Beshear, said the crash was "tough news" and warned of casualties.

Officials confirmed the nine deaths, according to The Washington Post, ABC News and Reuters.

Authorities are expected to provide an update later.

The crash happened at about 21:35 local time (01:35 GMT) in the Trigg County area, close to the large Fort Campbell military base.

In a statement to BBC News earlier, a US Army spokesperson said two HH60 Blackhawk helicopters had crashed during "a routine training mission".

"The command is currently focused on caring for the service members and their families."

Asked by the BBC if the two helicopters had crashed into each other, the spokesperson said it "was unable to confirm specifics at this time".

They added the incident was under investigation and more information would be released as it becomes available.

According to the US Army's website, the 101st Airborne Division is its only air assault division and has been sent to conflict zones internationally.