The North's Foreign Ministry spokesman said a delegation of the North returning from a U.N. conference on the rights of persons with disabilities "was literally mugged" at the John F. Kennedy airport in "an illegal and heinous act of provocation."
"Diplomats of a sovereign state are being robbed of a diplomatic package in the middle of New York where the headquarters of the United Nations is located and that serves as the venue for international meetings including the United Nations General Assembly," the spokesman said.
"This clearly shows that the U.S. is a felonious and lawless gangster state," the spokesman said in comments carried by the North's official KCNA news agency.
"The international community needs to seriously reconsider whether or not New York, where such an outrageous mugging is rampant, is fit to serve as the venue for international meetings," KCNA said.
KCNA said the incident took place on June 16 when more than 20 officials who claimed to be from the US. Department of Homeland Security and police "made a violent assault like gangsters to take away the diplomatic package from the diplomats."
The diplomats were in possession of a valid diplomatic courier certificate, KCNA said.
Pyongyang warned that if the White House failed to give due response to the North's "reasonable and fair demand" on the incident, it would be "totally responsible" for all the consequences.