North Korea: Preparations Noted For Possible Nuclear Test

Activity at a North Korean nuclear test site in Punggye-ri in North Hamgyong province may indicate that preparations for a third nuclear test are underway, South Korea's Chosun Ilbo reports.

The North has reportedly dug a tunnel more than 500 meters (1,640 feet) deep, said South Korean intelligence officials cited by the paper. At this rate, the North should reach a depth of 1 kilometer (0.62 miles) between March and May.

It is possible to conduct nuclear tests at that depth, according to experts.

There is also ongoing construction of a new building at North Korea's main nuclear site in Yongbyon, intelligence officials said.

The construction at both sites appears to be continuing at a steady pace despite winter conditions, said the sources.

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