Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Fire at Iran's Natanz Nuclear Facility Caused Significant Damage, Spokesman Says Reuters DUBAI, UNITED ARAB EMIRATES - A fire that broke out at Iran's Natanz nuclear facility Thursday has caused significant damage that could slow the development of advanced centrifuges, an Iranian nuclear official said Sunday. Iran's top security body said on Friday that the cause of an incident and fire at Natanz had been determined and would be announced later. Some Iranian officials have said it may have been caused by cyber sabotage and one warned that Tehran would retaliate against any country carrying out such attacks. .