American and international investigators say that they have found the electronic blueprints for an advanced nuclear weapon on computers that belonged to the nuclear smuggling network run by Abdul Qadeer Khan, the rogue Pakistani nuclear scientist, but that they have not been able to determine whether they were sold to Iran or the smuggling ring's other customers.
The plans appear to closely resemble a nuclear weapon that was built by Pakistan and first tested exactly a decade ago. But when confronted...
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