Iran shows U.N. official all nuclear sites -- envoy

VIENNA (Reuters) - Iran allowed a senior U.N. nuclear inspector rare access to a facility for developing advanced uranium enrichment machines during a tour of all of the country's main atomic sites, an Iranian envoy said on Tuesday.

Ali Asghar Soltanieh, Iran's ambassador to the International Atomic Energy Agency, said last week's visit to Iranian nuclear facilities by IAEA Deputy Director General Herman Nackaerts showed Tehran's "100 percent transparency and openness".