Family declines autopsy for United States student released by North Korea

US President Donald Trump on Tuesday again condemned the "brutality" of the North Korean regime over the death of US student Otto Warmbier and said his treatment was "a total disgrace".

South Korean President Moon Jae-in on Tuesday said North Korea should swiftly return South Koreans and Americans detained in the reclusive nation and that Pyongyang had "a heavy responsibility" in the death of a United States university student.

The senator from Arizona says, "There should at least be a form for them to fill out that says, 'If I go to North Korea, I understand I am taking great risk, and I do not hold the American government responsible'".

Otto Warmbier, 22, died at a hospital in Cincinnati, Ohio on Monday, a week after being released from North Korea in a coma.

For months, President Donald Trump, Vice President Mike Pence and top aides have staked any progress dealing with North Korea's burgeoning nuclear program on China's involvement.

The Trump administration secured Warmbier's release from North Korea last week on humanitarian grounds after almost 18 months of imprisonment.

US State Department spokeswoman Heather Nauert said earlier the US would hold North Korea accountable for Warmbier's "unjust imprisonment" and called for the release of three other Americans detained in the country.

"That should never, ever be allowed to happen, and frankly, if he were brought home sooner, I think the result would have been a lot different".

The coroner's office in Cincinnati is investigating the death of an American college student who died less than a week after his return from North Korea, where he was detained for almost a year and a half.

Tony Kim, who also goes by his Korean name, Kim Sang-duk, is a 58-year-old US citizen who was temporarily teaching an accounting course at the Pyongyang University of Science and Technology, North Korea's only private university.

In addition, between 800 and 1,250 Americans visited North Korea annually in past years, according to tour companies working in the reclusive country. A naturalized US citizen who was born in South Korea, he is a businessman in his mid-60s who at one time lived in Fairfax, Virginia.

Warmbier died Monday in OH, where he had been hospitalized since his June 13 release. Several senators said they were considering a travel ban.

Wambier's parents did not cite a specific cause of death but blamed "awful, torturous mistreatment" by North Korea. No licenses would be issued for tourism.

The U.S. doesn't now prohibit its passports from being used to travel to any countries, even though financial restrictions limit U.S.travel to Cuba and elsewhere.

The Trump administration doesn't need an act of Congress to bar Americans from traveling to North Korea.

The number of Americans in North Korea at any given time fluctuates and is hard to determine. It said his medical records from an air ambulance service that brought him to OH and from the University of Cincinnati Medical Center, where he was hospitalized until his death Monday, have been reviewed, and the treating physicians have been interviewed extensively.

Senate Armed Services Committee Chairman John McCain, R-Ariz., left, confers with Sen.