WASHINGTON -- U.S. and Asian officials with access to the latest intelligence on North Korea say strong evidence has emerged in recent weeks that the country has built a second, secret plant for producing weapons-grade plutonium, complicating both the diplomatic strategy for ending the program and the military options if that diplomacy fails.
The discovery of the new evidence, which one senior Bush administration official cautioned was "very worrisome, but still not conclusive," came just as North Korea declared to the United States 12 days ago that it had completed reprocessing 8,000 spent nuclear fuel rods, enough to make a half dozen or so nuclear weapons.
U.S. officials have said they cannot verify that claim, though they confirm that sensors set up on North Korea's borders have begun to detect elevated levels of krypton 85, a gas emitted as spent fuel is converted into plutonium. …
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