A problem with the electrical distribution grid of Iran's Natanz nuclear facility caused an incident at the site yesterday, Iranian Press TV reported, a day after Tehran launched new advanced uranium enrichment centrifuges at the site. The Natanz facility, which is located in the desert in the central province of Isfahan, is the centrepiece of Iran's uranium enrichment programme. "The incident caused no casualties or contamination," Iran's Atomic Energy Organization spokesman Behrouz Kamalvandi said, adding that "electricity was affected at the Natanz facility". The cause was being investigated, Kamalvandi told Iran's semi-official Fars news agency. In July last year, a fire broke out at the Natanz facility, which the government said was an attempt to sabotage Iran's nuclear programme.