The father of an American student who was medically evacuated from North Korea in a coma has criticised the Obama administration for not doing enough to help him, and attack the Chinese tour company for “luring young Americans” to be imprisoned by the pariah state.

Fred Warmbier fought back tears as he told a press conference in Wyoming, Ohio that he was wearing the jacket that his son Otto, now 22, wore during his trial in March 2016.

And he spoke of his immense pride in his son, who landed back in the US on Tuesday night - describing him as “an adventure-seeking kid”.

“We’ve been brutalised for the past 18 months with no information, misinformation,” said Mr Warmbier.

“We are proud that our family is happy, positive people. We are thrilled our son is back on American soil.”

Otto was in North Korea on a tour organised by Young Pioneer tours – a Chinese company promoting trips to the rogue state. He was en route to Hong Kong, where he was due to complete a study abroad programme as part of his course at the University of Virginia.