The parents of Otto F. Warmbier, the American student detained by North Korea who died shortly after he had been flown home comatose in June, said Tuesday that he had been tortured, describing his captors as “terrorists.”

In an interview on the “Fox & Friends” morning news program, their first since Mr. Warmbier died three months ago, Fred and Cindy Warmbier of Cincinnati provided previously undisclosed details on the injuries to their son, 22, a University of Virginia undergraduate.

The Warmbiers said they had decided to speak out now partly because they were aghast at efforts by the North Korean government to portray itself as the victim of United States aggression in the unfolding crisis over the North’s nuclear weapons and missile testing.

“We’re here to tell you North Korea is not a victim,” Fred Warmbier said. “They’re terrorists. They kidnapped Otto, tortured him, they intentionally injured him.”