Seven people were killed on Wednesday in South Korea when an Army helicopter crashed after completing a medical emergency mission, news reports said.
The UH-1H helicopter, carrying seven military personnel, crashed in the early morning near a mountain east of Seoul, national Yonhap news agency said, citing army officials.
After delivering an emergency patient to a military hospital near Seoul, the chopper was returning to its base when the accident occurred.
Investigators were looking for clues about what caused the predawn crash.
"Immediately after the accident, the Army searched the areas, mobilising all its available sources, and located the bodies of all seven people on board and the wreckage of the helicopter," the Army said, according to Yonhap.
On board the aircraft were two Army pilots, two medical officers and three enlisted members, it said.