Warmbier landed in Cincinnati Tuesday night. He was carried off the plane and taken to a hospital.
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His parents said he's been in a coma for more than a year.
They said "We want the world to know how we and our son have been brutalized and terrorized by the pariah regime" in North Korea.
A state department official and a source close to the family said the 22-year-old contracted botulism last year and slipped into a coma after taking a sleeping pill.
Warmbier was sentenced to 15 years hard labor in 2016 for allegedly committing "hostile acts" against the North Korean regime.
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Authorities said they had footage of him trying to steal a banner with a political slogan at his hotel.
RELATED: Otto Warmbier released from North Korea
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