All 14 people aboard a helicopter were killed as it crashed in the Andes, Peru's southern region, according to the police.
The chopper was bound for Cusco which left the Amazon region of Madre de Dios on Wednesday.
According to reports, the authorities found Sikorsky S-58ET at an altitude of about 4,900m (16,000 feet) near Mount Mamarosa on Saturday. The mountainous region is regularly covered by clouds.
"Everyone died in the initial impact because everything is burned and scattered," the Press Association quoted the police commander Raul Aybar as saying.
He said the chopper crashed into the snowy Mamarosa and exploded.
According to Peru's police chief, Gen Raul Salazar, parts of the copter were strewn across the crash site, even up to 200 meters in the area.
The 12 passengers included a Dutchman, a Czech, a Swede, eight Koreans and a Peruvian. The two crew members of the helicopter were Peruvians.
The South Korean Embassy in Lima said its nationals were exploring a potential hydro-electric project near Puno, in southern Peru and they were returning to Cusco after conducting an aerial surveillance.
South Korea's Water Resources Corporation has sent their vice-president to Peru to identify the victims.
The Samsung C&T Company, whose employees were part of the team, said their representatives also flew to Peru.
Bodies were being recovered from the crash site though bad weather and darkness hampered the rescue operations. Temperature at the crash site was as low as -15 Celsius along with snow and rain in the region.
It took nearly seven hours for the mountain rescue team to reach the area.
Cusco region is famous for the historic Machu Picchu, a 15th Century Incan city on a mountain above the town of Aguas Calientes and thousands of people visit the area every year.