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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.

Correspondent Kim Yun-su reports from Washington.

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The State Department said in a report related to the 2020 arms control, non-proliferation and disarmament agreements submitted to Congress, it is said that North Korea's nuclear activities have 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 caught.

In addition, based on the IAEA's investigation that there was mining activity in the Uranium mine 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 not allowing international inspections of Punggye-ri's nuclear test site was the cause of questioning further nuclear tests.

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

The US State Department emphasized that the North Korean sanctions will remain intact until the final and fully denuclearized denuclearization, despite continuing efforts to resume North American negotiations after the collapse of the Hanoi summit in February last year.