Pakistani media said six people, including two prominent generals, were killed in a military helicopter crash in Balochistan, southern Pakistan.
The AS-350 Eurocopter helicopter was flying from Quetta to Karachi on Monday as part of flood relief operations in Balochistan.
The helicopter wreck was found hours after contact was lost.
On board, the helicopter was the commander of the 12th Corps, Lieutenant-General Sarfaraz Ali, who was supervising relief operations in the area, in addition to another general.
Reports from Pakistan identify the other five killed as Brigadier Amjad Haneef (DG Coast Guard), Major Saeed (the pilot), Major Talha (the co-pilot), and Naik Mudasir (crew member).
According to further reports, the chopper lost contact with ground control, shortly after taking off from a base in Balochistan's Lasbela district.
A senior police official told local media that the mountainous terrain in the sparsely populated area was hampering attempts to locate the wreckage, bodies or survivors.