Yun demanded his release, the White House said.
Price said Thursday the Obama administration's efforts secured the release of at least 10 other Americans from North Korea. Fred Warmbier addressed the media from Wyoming High School, where his son graduated. They say that he suffered from botulism and then took a sleeping pill and that he had been in his current state since then.
New details that emerged Thursday about Yun's brief visit to the North Korean capital illustrate the deep level of estrangement between the US and North Korea, two countries that don't have diplomatic relations and have technically been in a state of war for more than half a century, despite the armistice that ended the Korean War.
An emotional Otto Warmbier pleas for forgiveness at a North Korean court. He suffered a "severe neurological injury", a University of Cincinnati Medical Center spokeswoman revealed Thursday.
The US student Otto Warmbier, who was released from North Korean detention this week, is in coma due to extensive brain damage.
Warmbier remains in a coma, but stable since being brought back to his home state of Ohio. He may be breathing on his own, but he still "shows no sign of understanding language, responding to verbal commands or awareness of his surrounding", the doctor said. Two security officials stopped and took Warmbier to a private room.
Warmbier traveled to North Korea with Young Pioneer Tours, a China-based tour company operated primarily by Western expatriates.
The U.S., South Korea and others often accuse North Korea of using foreign detainees to wrest diplomatic concessions. He was medically evacuated from the country and arrived in Cincinnati late Tuesday.More news: White House: Donald Trump won't sack special counsel investigating Russian 'meddling'
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The group landed in Beijing Capital International Airport, but when their tour guide called a colleague, who was with Warmbier still in North Korea, he said he couldn't travel because he felt ill.
Doctors plan a news conference on campus later Thursday.
"There is no excuse for any civilized nation" to have kept his condition a secret and denied him medical care for so long, Fred Warmbier said, wearing the jacket his son wore at the sham trial that ended with his imprisonment in North Korea.
Warmbier has undergone a battery of tests since his arrival at the UC Medical Center on Tuesday night.
By his account, delivered at a scripted "news conference" weeks after his arrest, Warmbier attempted a foolish but harmless prank: trying (unsuccessfully) to pilfer a propaganda poster from the hotel where he was staying.
The U.S. recently obtained intelligence reports suggesting that North Korean authorities repeatedly beat Warmbier while he was in custody, a senior American official told The New York Times.
"Otto was just a really great lad", Danny Gratton, Otto's roomate on the trip, told the Washington Post.
North Korea sentenced Warmbier to 15 years of hard labor for stealing a banner as a joke.
Asked by a reporter if he felt the Obama administration should have done more to help, Warmbier replied, "I think the results speak for themselves".