A team of three-nation nuclear experts on Wednesday went to Yongbyon to examine the nuclear facilities and discuss the measures of disabling nuclear facilities in the Democratic People's Republic of Korea (DPRK).
"The team will conclude its mission and leave Pyongyang on Saturday," said an expert of the team on condition of anonymity.
But he refused to give any further details about this visit.
The experts team visited the DPRK at Pyongyang's invitation, which was described as a "significant step toward denuclearization of the Korean Peninsula" by U.S. Assistant Secretary of State Christopher Hill last Friday.
The team includes seven experts from the United States, one from China and one from Russia.
The U.S. group, headed by Sung Kim, a U.S. State Department official, arrived in Pyongyang after crossing the border between South Korea and the DPRK at the truce village of Panmunjom on Tuesday.
On the same day, the Chinese expert and Russian expert arrived here by plane.