Otto Warmbier, a U.S. citizen released from North Korea on Tuesday, is in a coma after sustaining a “severe neurological injury” in the country, a spokesperson from the University of Cincinnati Medical Center told U.S. media on Thursday.

Spokesperson Kelly Martin was quoted as saying that Warmbier suffered the“severe neurological injury” but is in a stable condition, according to the Associated Press and CNN.

The assessment appears to contradict the North Korean version of events that claimed Warmbier contracted botulism and subsequently fell into a coma in March of 2016 after taking a sleeping pill.

Warmbier, a student of commerce