North Korea has issued its first comments on the death of U.S. college student Otto Warmbier, who had been held by Pyongyang for more than a year before his June 13 release, calling the 22-year-old¡¯s passing ¡°a mystery¡± and labeling themselves as ¡°the biggest victim of this incident.¡±

Warmbier¡¯s family announced his death Monday, with his father blaming it on the ¡°awful, torturous mistreatment ... at the hands of the North Koreans.¡± The onetime University of Virginia student, who was released in a coma, was freed on ¡°humanitarian grounds,¡± the North said earlier.

In a statement carried Friday by the state-run Korean Central News Agency, a North Korean Foreign Ministry spokesman denied that Pyongyang had tortured or beaten Warmbier, saying that it was the victim of a ¡°smear campaign¡± and that U.S. doctors could attest to their claims.