BBC News 
December 17, 2013
Six American soldiers have died in a crash involving an aircraft in southern Afghanistan, the International Security Assistance Force (Isaf) says.
The cause of the crash in Zabul is unknown and an investigation is under way, Isaf said.
Initial reports indicated there was “no enemy activity in the area” at the time of the incident, a short statement said.
US defence department officials confirmed the victims’ nationalities.
The deputy governor of Zabul province told the Associated Press news agency that a Nato helicopter had crashed in the remote district of Shajau.