A source told the New York Post: "He has been suffering from cancer and he had a relapse. He wasn’t depressed, he was a lovely guy. On Sundays everyone went to his house, there would be the guy who worked in his local restaurant sitting by the pool by Michael Caine".
Another source told the newspaper: "He had been in the hospital earlier this summer, in the past few months, and he had been recuperating. The official story was it was a hip operation, but people suspected he underwent another cancer operation".
More top news
The hotel chain said three of its properties - in Maidenhead, Brentford and Tottenham - have been investigated during a detailed assessment
In its first response since the 22-year-old's death, North Korea said Mr Warmbier was treated "according to international standards".
Police would face "real challenges" tackling a repeat of the London riots after years of cuts, one of Britain's most senior officers warns.