The parents of college student Otto Warmbier, who died after spending a year in a North Korean prison, detailed their son's injuries after he was returned by North Korea to the U.S.

What did they say?

On Fox News' "Fox & Friends" Tuesday, Otto's parents, Fred and Cindy Warmbier, called the North Korean country "terrorists."

"They're terrorists," Fred said. "They kidnapped Otto. They tortured him. They intentionally injured him."

Fred and Cindy disputed initial reports that indicated their 22-year-old son was returned home in a state of a coma, and said that when they first saw him, he was "jerking violently" and emitting "inhuman sounds."

Describing the moment when Fred and Cindy entered the plane to see their son for the first time, Fred said that Otto was making a "howling, involuntary, inhuman sound."

"[He was] jerking violently, making these inhuman sounds," Fred said.

Describing his son's physical appearance, Fred continued, "Otto had a shaved head. He had a feeding tube coming out of his nose ... he was staring blankly into space jerking violently. He was blind, he was deaf."

Fred said that it looked like someone had "taken a pair of pliers and rearranged [Otto's] bottom teeth."

He also noted that his son had a large scar on his right foot, but did not elaborate.

"They destroyed him," Cindy said.

"They purposely and intentionally injured Otto," Fred added. "They kidnapped Otto. They tortured him."

Why was Warmbier arrested?

Warmbier, who was a student at the University of Virginia at the time, was arrested by North Korean officials in January 2016 after he allegedly tried to steal a North Korea propaganda poster.

In return for his alleged theft attempt, Warmbier was sentenced to 15 years of hard labor in a North Korean detention center.

After spending just a year incarcerated, Warmbier was returned to Ohio in the U.S. by North Korea in June.

Saying he was dealt with according to domestic law and international standards, North Korea has denied it mistreated or tortured Warmbier.

Despite a report by NBC News that Warmbier had been returned to the U.S. "well-nourished" but in a"state of unresponsive wakefulness," Warmbier died just days after being returned to the U.S.