Doctors there said they found no traces of active botulism, a toxin that can cause nerve injury.
About 2,500 mourners lined up early on Thursday morning at Wyoming High School, in the Cincinnati suburb of Wyoming.
"All those that wish to join his family in celebrating his life are cordially invited", said the Spring Grove Cemetery and Arboretum.
An Ohio coroner, abiding by family wishes, has performed an external examination instead of a full autopsy on the body of the USA student who was held prisoner in North Korea for 17 months and sent home in a coma.
In addition to the external exam, the coroner's office reviewed Warmbier's medical records from the University of Cincinnati Medical Center and AeroMed Management Group, the air ambulance service that helped evacuate him from North Korea's capital where he had been detained for almost 17 months.
Warmbier's parents say he became ill after he was imprisoned, and that the North Koreans claimed that he contracted botulism and fell into a coma after taking a sleeping pill. Although he opened and closed his eyes, the doctors said there were no signs that he understood what was going on in his surroundings.
His treating physicians said he suffered from unresponsive wakefulness, a condition also known as persistent vegetative state.
The aide said Portman specifically urged North Korea's government to allow the Swedish ambassador to the country - the main USA conduit to Pyongyang - to meet with the American student.
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Ronda Rousey of the United States (left) faces-off with compatriot Holly Holm for the UFC fight in Melbourne on November 13, 2015. Speculation has the two fighters earning approximately $175 million combined for the bout. "The impossible deal is now done".
Trump has been seeking greater cooperation from China to put pressure on its ally North Korea. His detention first made headlines in January 2016 after which he confessed that he had been spying for South Korea, but CNN isn't sure whether or not the statement was made under duress.
Young Pioneer Tours, the China-based group Warmbier used for his trip, said it would no longer take Americans to the country.
Warmbier's death has only heightened tensions aggravated by dozens of North Korean missile launches and two nuclear bomb tests since past year.
The Chinese state-run Global Times warned in an editorial that if Washington imposes sanctions against Chinese enterprises "it will lead to grave friction between China and the U.S". While almost all Americans who have been there have left without incident, visitors can be seized and face lengthy incarceration for what might seem like minor infractions.
The U.S. military said the bombers conducted two separate drills with the Japanese and South Korean air forces. John McCain said that Americans who are "stupid" enough to still want to visit North Korea should be required to sign a waiver absolving the USA government of any blame if they're harmed while there.
Seoul's Defense Ministry said the bombers engaged in routine exercises with South Korean fighter jets aimed at showing deterrence against North Korea.
Korean-Americans Tony Kim and Kim Hak Song, who worked at the foreign-funded Pyongyang University of Science and Technology, were recently detained for hostile acts against the government, according to North Korea's state media.
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