Coroner examining death of US student released by North Korea

North Korea must bear "heavy responsibility" for Warmbier's death, said South Korean President Moon Jae-in.

Trump said he had spoken with Warmbier's parents, telling reporters in the Oval Office that it was "incredible what they've gone through".

Sen. John McCain, R-Arizona, says Americans who are "stupid" enough to want to visit North Korea should be required to sign a waiver absolving the USA government of any blame if they're harmed while they are in the country.

While there were no physical evidence that he was beaten, doctors said Mr Warmbier had suffered "extensive loss of brain tissue", suggesting he had lost a lot of blood supply to his brain for a long period of time.

Otto Warmbier, 22, returned to the USA last Tuesday, after he spent 17 months in North Korea where he was arrested.

Warmbier's parents haven't cited a cause of death, but "awful, torturous mistreatment" by North Korea.

"They just murdered him", McCain said.

"First we must vie for a freeze of North Korea's nuclear and missile programs", Moon said. Tour operators told the wire service that Americans account for about a fifth of all non-Chinese tourism to North Korea. North Korea has detained two Korean-American academics and a missionary, a Canadian pastor and three South Korean nationals who were doing missionary work there.

"I believe we must now have the perception that North Korea is an irrational regime", Moon told the CBS television network.

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South Korea says the United States has flown two supersonic bombers over the Korean Peninsula in a show of force during joint military drills. He was sentenced to 15 years of hard labor in prison, but was released in June, 17 months after his arrest, in a coma.

But he firmly rejected two statements issued last week by Tomas Ojea-Quintana, the United Nations special rapporteur on human rights in North Korea, about detainees and stalled family reunions between Koreans on both sides of the divided peninsula.

No one anticipated that Warmbier would be abused in a way that more closely resembles the manner in which North Korea treats its own citizens, where those who cross the government or show disloyalty to leader Kim Jong-Un face severe consequences, including death.

"When it comes to preemptive strike. this is something we may be able to discuss at a later state when the threat has become even more urgent", he said, adding that the North Korea nuclear missile threat was a matter of life or death for the South Koreans who live next door.

Republican Sen. Rob Portman said North Korea should be "universally condemned for its abhorrent behavior". "His neurological condition can be best described as a state of unresponsive wakefulness", one of his doctors said last week. North Korea accuses Washington and South Korea of sending spies to overthrow its government. The coworker also said Kim and his wife had two sons who had attended a local global school before moving to the United States for a college education.

And the pro-Pyongyang Korean Friendship Association said Mr Warmbier's crime was as bad as punching Her Majesty. He said he was kept isolated most of the time but not physically abused.

The family of an American college student who died days after being released from North Korea in a coma says the 22-year-old "has completed his journey home".

The last thing conservatives want, the argument goes, is curious American tourists talking with citizens and undercutting decades of propaganda that assures North Koreans that they are the envy of the world.

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