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More than 200 people are believed to have died when a tunnel at North Korea’s main nuclear test site collapsed in September after the country’s sixth and most powerful atomic test — an accident that could have far-reaching implications for the North’s nuclear weapons program.

The tunnel at the Punggye-ri test site was undergoing construction around Sept. 10, a week after the Sept. 3 nuclear explosion, when an initial collapse killed about 100 workers, Japan’s TV Asahi reported Tuesday, citing unnamed sources in the isolated country. After rescuers were sent in, a second collapse left at least 100 more feared dead.

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