SEOUL, Oct. 4 (UPI) -- South Korean intelligence is working to identify possible test sites for any North Korean nuclear weapons test, the Korea Herald reported Wednesday.
So far, experts have focused on four areas -- Gilju in North Hamgyeong province, and Hagap, Mount Mumyeong and Gimdangol in Jagang province.
The newspaper said Gilju was believed the most feasible for an underground test and said North Korea had built a pit in the area.
North Korea earlier this year threatened to conduct an underground nuclear test amid threats of international sanctions over its refusal to return to international negotiations over its nuclear weapons program.
In July, in an act of defiance, it test fired more than a half-dozen missiles, some of them capable of striking Japan.
Earlier this week it repeated its threat of a nuclear weapons test.
