Iran says damage at nuclear site 'significant'

An accident at a nuclear complex in Iran caused significant damage and could slow the production of centrifuges used to enrich uranium, the country's atomic energy spokesman said. The incident happened on Thursday at a warehouse under construction at the Natanz complex in central Iran, but caused no casualties or radioactive pollution, according to the Islamic republic's nuclear body. Security officials called it an accident and said they had determined the cause, without providing any further explanation.