U.N. inspectors found traces of highly enriched , weapons-grade uranium at an Iranian nuclear facility , a report by the U.N. nuclear agency says .
U.N. inspectors found traces of highly enriched , weapons-grade uranium at an Iranian nuclear facility , a report by the U.N. nuclear agency says .
United Nations inspectors have discovered traces of highly enriched uranium near an Iranian nuclear facility , heightening worries that the country may have a secret nuclear weapons program .