Warmbier’s  doctors said they do not have any information regarding the kind of medical care he received in North Korea but that they found no evidence that he contracted botulism.  “We have no certifiable knowledge of the cause or circumstances of his neurological injuries, this pattern of brain injury is usually seen as a result of cardiopulmonary arrest where the blood supply to (the) brain is inadequate for a period of time, resulting in the death of brain tissue”, Kanter said.

Warmbier’s parents said they had learned about their son’s condition, which North Korea told them was a coma last week. Father of the boy, Fred Warmbier said he refused to accept North Korea’s explanation that his son fell into a coma after contracting botulism and taking a sleeping pill in March 2016.