North Korea says it will not give up on its nuclear deterrence unless Washington ends its hostile policy toward Pyongyang and dissolves the US-led United Nations command in South Korea.
North Korea reportedly claims members of its delegation were "literally mugged" by USA authorities at John F. Kennedy Airport, condemning America as a "felonious and lawless gangster state".
The North Korean delegation was in NY to attend the Conference of States Parties to the Convention on the Rights of Persons with Disabilities, the KCNA report said.
A foreign ministry spokesperson speaking through KCNA called the US a "felonious and lawless gangster state".
During the so-called "planned and organized provocation", more than 20 officials, including police and officials claiming to be from the U.S. Department of Homeland Security, reportedly "made a violent assault like gangsters to take away the diplomatic package from the diplomats", as described by the spokesman.
It added that the ministry also asked the worldwide community to "seriously reconsider" NY as a venue for major global events.
North Korea did not detail the contents of the package.
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The White House and the US State Department had issued no immediate comment on the North's statement.
North Korea had accused Mr Warmbier - who had been on a tour of the country - of stealing a propaganda sign, claims disputed by those who were with him on the trip.
A North Korean foreign ministry spokesman told state news agency KCNA that its officials had been "robbed", branding the USA a "lawless gangster state".
City Councilman Joe Borelli (R-Staten Island) said of the North Koreans: "Given their explanation of Warmbier's condition, I wouldn't rush to judgment".
"As the diplomats vigorously resisted, they [US authorities] grabbed the diplomatic package using physical violence and made off", said the spokesperson, who did not disclose the contents of the diplomatic package.