The State Department's Bureau of Intelligence and Research says that the successor would probably be one of Kim Jong-il's two sons -- Jong Nam, 32, or Jong Chol, 22.
"Because the two have different mothers, there are tensions between their families. To our knowledge, neither has moved through the grooming process far enough to dominate the other. We are unaware of any possible successor who is not a blood relative," the State Department says.
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