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report by the US government that North Korea has more nuclear facilities that have not yet been identified and is likely to build an additional nuclear test site. The report also included that sanctions against North Korea would remain until complete denuclearization.

Washington Correspondent Kim Yun-su reports.

<Reporter> In a

report on the 2020 arms control, non-proliferation, and disarmament agreements submitted to Congress, the US State Department said it had great concern that North Korea's nuclear activities continued throughout the past year.

As a basis for North Korea's continued nuclear activities, it cites a report from the International Atomic Energy Agency (IAEA) published last August.

In the nuclear fuel rod manufacturing plant in Yongbyon, North Korea, there were signs of using centrifugal uranium enrichment facilities until last year, and in March of last year, signs of testing of cooling facility parts were captured.

In addition, based on the IAEA's investigation that there was mining activity in the Uranium mines in Pyeongsan, the US State Department determined that there may be additional nuclear facilities in North Korea that have not been identified.

Reports also included an analysis that North Korea could return its closed nuclear test site to Punggye-ri.

The US State Department said that disallowing international inspections of the Punggye-ri nuclear test site was a question that raised questions about further nuclear tests.

It also predicted that North Korea could possibly build another nuclear test site.

The State Department emphasized that North Korea's sanctions will remain intact until the final and fully verified denuclearization, despite efforts to resume North American negotiations after the breakup of the Hanoi summit in February last year.