The news of signs indicating the North is readying a nuclear test comes as Pyongyang is gearing up for a ruling Workers Party congress in early May, where leader Kim Jong-Un is likely to boast about his achievements in building a weapons programme.
The likelihood of North Korea conducting a fifth nuclear test, possibly within weeks, has increased because of a failed missile launch on Friday that was an embarrassing setback for leader Kim, South Korean officials and international experts said.
North Korea missile launch fails in embarrassing setback for leader Kim
"Compared to last month, the frequency of vehicle, workforce and equipment movements increased two-to-threefold recently," Yonhap News Agency said, quoting multiple government sources.
The possible test, if it happens, follows a fourth nuclear test in January and a long-range rocket launch in February, which led to new UN sanctions that have failed to halt Pyongyang's weapons programmes.
North Korea threatens nuclear test, defying UN
South Korea's military has said Pyongyang is technically ready for an additional nuclear test, depending on its leadership's political decision. The South Korean defence ministry said it could not confirm the report but reiterated that North Korea can conduct its new nuclear test at anytime.
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