Six American troops have been killed in a helicopter crash in southern Afghanistan, Nato has announced.
It is believed all six of those who died in the accident were US marines, although there are no reports of enemy activity in the area.
A Nato spokesman refused to give any details of the crash until the families of those on board had been informed.
"The cause of the crash is under investigation, however initial reporting indicates there was no enemy activity in the area at the time of the crash," he said.
The accident is the worst since August last year, when 30 soldiers, including 22 elite Navy Seal commandos, died when their helicopter came down in eastern Afghanistan. Source