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Iran Is Said to Signal Nuclear Cooperation by Slowing Expansion

Iran has signaled a willingness to halt the expansion of nuclear work at the center of its decade-long dispute with world powers, according to diplomats familiar with the investigation into the atomic program.

Iran stopped installing machinery to boost production at its uranium-enrichment facility even as the stockpile of its most sensitive nuclear material grew to a record, United Nations nuclear monitors reported. The Persian Gulf nation also slowed construction of a reactor at Arak.