NBC said the intelligence assessment, which had not previously been reported, seemed to counter the sentiments expressed by President Donald Trump, who tweeted after his historic June 12 summit with Kim in Singapore that there was no longer a nuclear threat from North Korea.
Joel Wit, a former diplomat who helped the USA negotiate with North Korea including a nuclear agreement between the US and the regime in 1994, said the US believed the rogue regime had two sites to "enrich nuclear fuel" including Yongbyon and another, but the name of the center was not revealed.
Last week, Trump said a process of "total denuclearisation. has already started" in North Korea while U.S. officials familiar with intelligence told Reuters news agency there was no evidence of new moves to dismantle sites since the summit.
However, he added: "Work is ongoing to deceive us on the number of facilities, the number of weapons, the number of missiles".
On Wednesday, Pompeo told lawmakers he was confident Pyongyang understood the scope of the United States desire for North Korea's complete denuclearization as the two countries negotiate after the summit.
Harris was a hawkish commander, once earmarked for the post of ambassador to Australia, and a strong supporter of joint military exercises between US and South Korean forces.
North Korea is under United Nations sanctions for its nuclear and weapons programmes and is widely condemned for human rights abuses.
One anonymous official said that even though the missile tests have stopped, "there's no evidence that they are decreasing stockpiles, or that they have stopped their production..."
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They also said that the Republican president had made too many concessions to Mr Kim, especially agreeing to stop military exercises with South Korea, which the North has long sought.
North Korea may be engaged in an worldwide game of "hide and seek", according to USA intelligence agencies, NBC News reported Friday.
The outlet spoke with anonymous officials briefed on an unreleased intelligence assessment.
Kim Jong Un's agreement to complete denuclearization of North Korea is part of his foreign policy objective of eventually ridding the world of all weapons of mass destruction, the Choson Sinbo claimed. Speaking at a Senate hearing, Pompeo reiterated that sanctions on Pyongyang would remain until it achieved "complete and verifiable" denuclearisation, Yonhap News Agency reported. "The North's nuclear cadre can be expected to proceed with business as usual until specific orders are issued from Pyongyang".
During the 33-minute conversation, Kang explained outcomes of the recent South Korea-Russia summit and the latest progress in inter-Korean dialogue and relations, while Pompeo explained Washington's preparations for its upcoming negotiations with North Korea, said the ministry.
Jeffrey Lewis, director of the East Asia Nonproliferation Program at California's Middlebury Institute of International Studies, said there were two "bombshells" in the NBC report.