A surge in activity at North Korea's atomic test site suggests preparations for a fifth nuclear test are in their final stages, possibly before a key political event in early May, South Korean media reported Sunday.
The frequency of vehicle, workforce and equipment movements at the Punggye-ri site have "increased two to threefold," since last month, Yonhap news agency said, citing multiple government sources.
Officials believe the trucks seen moving in and out of the complex are likely carrying nuclear technicians.
"If they are signs of nuclear test preparations, it seems the preparations are in the final stages," Yonhap quoted one government source as saying.
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