Rodman was in Pyongyang on a trip with the Harlem Globetrotters.
Kim Jong-un, who is a basketball fan, was told by Rodman that he had made "a friend for life."
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America says it has "identified preparations" for an attack similar to that which killed at least 86, including 30 children, in April.
Despite the rain it will still feel muggy with highs of 22C.
The practice of sending mental health patients far away from friends and family for care has become endemic in the NHS, it has been warned.