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Their release was a striking contrast to the fate of Otto Warmbier, an American university student who died last year days after he was released from North Korea in a coma after 17 months in captivity. Warmbier and other previous American detainees in the North were imprisoned there over a variety of alleged crimes, including subversion, anti-state activities and spying.

https://www.nbcnews.com/news/world/north-korea-deport-american-it-claims-was-directed-cia-n937061