Top North Korean officials have discussed the country's intention to deceive the U.S. about the number of nuclear warheads in its possession, including a strategy to potentially declare they have denuclearized after disposing of 20 weapons while retaining dozens more, according to a report by The Washington Post.

Monday's report, citing intelligence gathered by U.S. spy agencies and unidentified officials, also said there were signs that North Korea is continuing to construct at least one, and possibly two, liquid-fueled intercontinental ballistic missiles (ICBMs) capable of reaching the United States.

The findings, including satellite photos taken in recent weeks, indicated that the work was under way at the same factory that produced the country's first large ICBM, the Hwasong-15, in Sanumdong, on the outskirts of Pyongyang, according to the report. It said that imagery collected by the National Geospatial-Intelligence Agency in recent weeks also pointed to "ongoing work on at least one Hwasong-15" at the Sanumdong site.