A military aircraft landed in Cincinnati late Tuesday night and Warmbier was reportedly taken directly to the University of Cincinnati Medical Center. Two ambulances were parked near an airport hangar.
"Our son is coming home", father Fred Warmbier said. He fell into a coma with sleeping pills. They all are naturalized Americans of Korean ethnicity. And how does the Trump administration respond?
Three other Americans remain imprisoned in North Korea.
The announcement comes as former National Basketball Association superstar Dennis Rodman makes a return visit to the hermit kingdom where he has regularly enjoyed access to the country's top leadership, including Supreme Leader Kim Jong-un.
"FILE â€" In this February 29, 2016 file photo, American student Otto Warmbier speaks to reporters in Pyongyang, North Korea. He has said he is just going to have a good time but has also hinted he is "trying to open a door" for better relations between Washington and Pyongyang. He was serving a 15-year service for pinching a poster while on a student trip to North Korea. Shortly before sentencing, was held a press-conference at which Warmbir, not hiding tears, asked forgiveness of the North Korean people, calling the attempt to steal the poster "the most bad mistake in life". He was charged with "hostile acts against the state". He was convicted in March 2016 and sentenced to 10 years hard labor, about a week after Warmbier's conviction - both sentences were handed down shortly after the USA had levied steeper sanctions against North Korea in response to missile testing.
He was sentenced in March 2016 after a televised tearful public confession to trying to steal a propaganda banner. Sweden represents US diplomatic interests in North Korea.
During a government-arranged news conference in Pyongyang, which was held a month before the ruling was handed down, a tearful Warmbier pleaded for his release, saying he stole the banner because a member of his church offered to buy him a used auto in exchange.
The North Korean court held that Warmbier had committed a crime "pursuant to the USA government's hostile policy toward (the North), in a bid to impair the unity of its people after entering it as a tourist".
But back in Pyongyang, the Swedes were allowed to see only one detainee, and it wasn't Warmbier.
As the Americans continued to push for the Swedish diplomats to see all four, North Korea's ambassador to the United Nations urgently requested a meeting with Yun in NY, according to Trump administration officials, who spoke on the condition of anonymity about the still-secret arrangements.
If it were, there might be pressure on President Trump to take action against Kim Jong-un's regime, he says.
Richardson, also a former congressman, energy secretary and ambassador to the United Nations, has always been involved in efforts to secure the release of prisoners and hostages, including those held by North Korea.
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"It wasn't a situation where they asked", the official said of the USA representatives.
"It was very North Korean", noted one pundit on CNN.
During his detention, Leigh said he was provided with one meal a day, and slept on a blanket on the floor. He visited Warmbier with two doctors on Monday, and demanded his release on humanitarian grounds.
But the important thing in the immediate future is Mr. Warmbier's health.
America appeared to be on a collision course with China today after Secretary of State Rex Tillerson warned that the U.S. was considering imposing sanctions on countries that do business with North Korea.
Last week, North Korean officials told Yun about Warmbier's medical condition.
A North Korean foreign ministry official, requesting anonymity because no formal North Korean statement had been released, said only that Warmbier was released and left the country Tuesday.
"In no uncertain terms North Korea must explain the causes of his coma", he said. "We want the world to know how we and our son have been brutalized and terrorized by the pariah regime in North Korea". "We'll be relieved to have him home and are looking forward to surrounding him with people who love him".
SEOUL - Senior officials of South Korea and the United States on Wednesday discussed plans for the upcoming summit between their heads of state.
Warmbier was supposed to graduate from the University of Virginia in May.
Secretary of State Rex Tillerson says the State Department secured the 22-year-old's release at President Donald Trump's direction.
"We strongly suggest that Americans do not go to North Korea", Nauert said.
Information from The Associated Press was used in this report.