Kenneth Bae, 44, who was born in South Korea but is an American citizen, has been held since November when he visited the North Korean city of Rason.
He was tried in the country's Surpreme Court on charges of plotting to overthrow the government but the exact nature of his alleged crime has not been revealed.
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Festival-goers have been enjoying the second day of the Glastonbury festival.
Former Conservative cabinet minister Lord Mayhew has died aged 86, his family has said.