Nine servicemen were tragically killed when two Black Hawk military helicopters smashed into each in mid-air at Kentucky's Fort Campbell last night.
Emergency services raced to the scene in Trigg County, Kentucky at around 10pm after the HH60 Blackhawks crashed into each other during a routine training exercise flying a "multi-ship formation under night vision goggles," in what has been described as a "truly tragic loss".
The helicopters were said to be from Fort Campbell - a US military base.