U.N. inspectors find high-grade uranium traces in Iran

VIENNA (Reuters) - United Nations nuclear inspectors have found uranium particles refined to a higher-than-expected level at an underground site where Iran has installed more than 50 percent more enrichment centrifuges, a U.N. watchdog report said on Friday. It said Tehran had told the U.N. agency that the presence of traces of highly refined uranium - still well below potential nuclear weapons ...