Four Pakistan Army personnel were killed when a military helicopter crashed during a casualty evacuation due to technical reasons in Gilgit-Baltistan, the army said on Sunday.

The chopper crashed in Minimarg area of Astore district on Saturday evening, the army said in a statement.

It was transporting the body of a soldier to the military hospital in Skardu.

The pilot, co-pilot and two soldiers were killed in the accident, the statement said, adding that the crash occurred due to technical reasons.

Gilgit-Baltistan information minister Fatullah Khan has expressed deep sorrow over the tragedy.