An American college student, who was released from detention in North Korea in a coma last week, has died.

Otto Warmbier's parents say the "awful torturous mistreatment" of their son ensured that "no other outcome was possible".

The 22-year-old was sentenced to 15 years in prison with hard labour in North Korea after he confessed he had tried to steal a propaganda banner.

He was held for more than 17 months.

The US President has been reacting to his death.

Melania and I offer our deepest condolences to the family of Otto Warmbier. Full statement: https://t.co/8kmcA6YtFD pic.twitter.com/EhrP4BiJeB

— Donald J. Trump (@realDonaldTrump) June 19, 2017