NATO says six service members have died in an aircraft crash in southern Afghanistan, in an area where there was no fighting reported at the time.
A defense official told CNN that those killed were all U.S. service members. One person reportedly survived.
The alliance says in a statement the crash occurred on Tuesday and that it's under investigation.
The troops' names have not been released at this time.
The U.S.-led international coalition has service members from several countries deployed in the south.
NATO says initial reporting indicated there was no fighting or insurgent activity in the area at the time of the crash.
Deputy governor of southern Zabul province, Mohammad Jan Rasoolyar, says a NATO helicopter crashed in the remote district of Shajau.
It was not immediately clear if he was describing the same incident.