South Korea’s mass-circulation Chosun Ilbo newspaper reported that U.S. spy satellites have detected steam coming from a nuclear facility at North Korea’s main Yongbyon plant, indicating the North is reprocessing spent nuclear fuel rods to harvest weapons-grade plutonium.
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Its report quoted an unnamed official. South Korea’s Defense Ministry and the National Intelligence Service — the country’s main spy agency — said they cannot confirm the report.

The North had said it would begin reprocessing in protest over international criticism of its April 5 rocket launch.