Wellington, Nov 21  At least seven people were killed on Saturday in a helicopter crash at New Zealand's Fox Glacier.

 
The helicopter wreckage was located in a crevasse on the glacier, but rescuers were unable to reach due to the difficult terrain, Radio New Zealand reported.
 
Operator, Alpine Adventures said the single-engine Squirrel helicopter took off from the Fox and Franz Heli Services base on a scenic flight.
 
The victims comprised the pilot and six passengers.
 
The cause of the crash remains unknown.