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Otto Warmbier had been detained in North Korea for more than a year.
The travel agency said in a statement on Tuesday that the assessment of risk for Americans visiting North Korea has become too high.
It says a tragedy like this must never be repeated.
The agency says that, despite constant requests, it was denied any opportunity to meet Warmbier, only receiving assurances that he was fine.
It says almost no information was disclosed about his period in detention.
Warmbier died on Monday, less than a week after he was returned to the United States in a coma.
Media reports say he fell into the coma during detention. Doctors who treated him in Ohio said he had a brain injury.
Source and image: NHK
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