Warmbier, 22, spent nearly a year and a half in captivity after being arrested in January 2016. He is believed to have been in a coma since March 2016, reportedly after being given a sleeping pill by prison officials.
Warmbier was sentenced to 15 years hard labor in March last year after traveling to North Korea while he was a student at the University of Virginia.
It's not clear what lies ahead for Warmbier.
"Even if you believe [the North Korean] explanation of botulism and a sleeping pill causing the coma, and we don't", Fred said. Doctors treating the students said the cause of brain damage remains unknown.
"While I welcome the news of Mr Warmbier's release, I am very concerned about his condition, and the authorities have to provide a clear explanation about what made him slip into a coma", Tomas Ojea Quintana, the United Nations special rapporteur on human rights in the Democratic People's Republic of Korea (DPRK), said in a statement issued in Geneva.
North Korea is hardly a top destination for American travelers. Trump directed him to do everything possible to secure their release. "And, also, we feel that you are an old friend", Kim Il-guk, the sports minister, told Rodman during a photo call attended by global media.
The doctors said they had no information about the care he received in North Korea. It was taken in North Korea with members of his tour group. Over the next days, officials said, Tillerson and Trump discussed the case.
Warmbier's father explained the circumstances surrounding his son's trip to North Korea, and the dangers associated with such ventures.
He said the president called to find out "how Cindy and I were doing, and wanted to know about Otto".
Dr. Brandon Foreman of University of Cincinnati Health said tests conducted at the hospital did not show the active presence of botulism. Yun demanded his release, the White House claimed. "U.S. citizens in the DPRK are at serious risk of arrest and long-term detention under North Korea's system of law enforcement".
USA officials wouldn't say if Yun met with other North Korean diplomats while in the country or conducted more extensive diplomacy.
Since his return, Warmbier hasn't talked, moved in any purposeful way or responded to verbal communication.
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Similarly in 2009, an air hostess on a Delhi-Vadodara flight caught a passenger masturbating. This, however, is not the first time that such an incident has been reported.
The U.S., South Korea and others often accuse North Korea of using foreign detainees to wrest diplomatic concessions.
At a news conference before his trial, a weeping Warmbier said he had made "the worst mistake of my life" and pleaded to be released.
The retired basketball player said before leaving for Pyongyang last week that his mission was to try to build bridges between the U.S. and the reclusive state.
"The fact that he was taken and treated this way is disgusting, and tough to process", Fred Warmbier said.
During his speech to press, Fred Warmbier called on North Korea to release other American prisoners, saying, "No other family should have to endure what the Warmbiers have".
His neurological condition was described by doctors 'as a state of unresponsive wakefulness'. "He has not spoken".
While doctors are uncertain as to what exactly caused the condition, cardiac arrest that stops the flow of blood to the brain is generally seen as resulting in the death of brain tissue. Kanter added that body scans had revealed no evidence of acute or healing fractures to the chest, abdomen or skull. The state-run Korean Central News Agency on Thursday said he had been sentenced to hard labour, but it did not comment on his medical condition.
On Thursday, the State Department said that its special envoy on North Korea, Joseph Yun, who negotiated Warmbier's release during a visit to the country this week, had also met with three other USA citizens being held in North Korea.
A state department spokeswoman said in Washington, DC that Warmbier's release followed "quiet diplomacy", at US President Donald Trump's suggestion. "We are glad that he is home, rejoined with his family", he said.
Bill Richardson, a former US ambassador to the United Nations, called for an investigation into what happened to Warmbier.
Otto Warmbier, an economics student from the University of Virginia, was arrested in January 2016 while visiting North Korea as a tourist.
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