The bodies of all eight people on board the US Marine helicopter that disappeared this week during a relief mission in earthquake-hit Nepal have been recovered, Nepal's army said Saturday.

The wreckage was found on Friday and the first three bodies retrieved the same day by Nepalese and US military personnel from the crash site in the mountains northeast of capital Kathmandu. The Nepalese army said in a statement Saturday that the remaining five bodies were also recovered.

The discovery of the wreckage followed days of intense search involving US and Nepali aircraft and US satellites. The aircraft, with six Marines and two Nepali soldiers on board, went missing while delivering aid on Tuesday.

Lt. Gen. John Wissler, commander of the Marine-led joint task force, told reporters in Kathmandu on Friday that his team could not immediately identify the cause of the crash of the UH-1 "Huey" or identify the bodies found.

Lt. Gen. John E. Wissler, right, speaks during a press meet in Kathmandu, Nepal, Friday, May 15, 2015. The helicopter was carrying six Marines and two Nepalese army soldiers. (AP Photo/Niranjan Shrestha)

He described the crash as "severe," and said the recovery team at the site encountered extreme weather and difficult terrain.

The wreckage was located about 24 kilometers (15 miles) from the town of Charikot, near where the aircraft went missing while delivering humanitarian aid to villages hit by two deadly earthquakes.

The area is near Gothali village in the district of Dolakha, about 80 kilometers (50 miles) northeast of Kathmandu.

The US relief mission was deployed soon after a magnitude-7.8 quake hit April 25, killing more than 8,200 people. It was followed by another magnitude-7.3 quake on Tuesday that killed 117 people and injured 2,800.