American student Otto Warmbier has died just days after being returned to the United States from North Korea in a comatose state.

The 22-year-old’s death on Monday was confirmed by his parents Fred and Cindy Warmbier. In a statement, they blamed his death on the treatment he had received at the hands of North Korea, where he had spent the last 17 months in prison for trying to remove a propoganda poster from his hotel.

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