North Korea has carried out significant tunneling on the west side of its main nuclear test site, indicating the potential for another bomb detonation, a US website said Thursday.
38 North, which monitors the reclusive state, said recent satellite imagery of the Punggye-ri nuclear test site shows increased activity around the West Portal through December last year.
"The North Portal, where the last five nuclear tests were conducted, remains dormant," it said, but "tunnel excavation has been stepped up at the West Portal."
Punggye-ri nuclear test site (Yonhap)
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