A fire that broke out on Thursday at a key Iranian nuclear facility has caused "significant damage", a spokesman for Iran's nuclear energy body has said.
Behrouz Kamalvandi, a spokesman for Iran's Atomic Energy Organisation, said on Sunday that security officials were not talking about what caused the Natanz fire "because of security reasons".
The fire occurred at "one of the industrial sheds under construction" at Natanz, Mr Kamalvandi said at the time.
The International Atomic Energy Agency (IAEA), which monitors Iran's compliance with a 2015 nuclear deal struck with world powers, said it anticipated no impact on its verification activities.
Iranian authorities said the blast was caused by "leaking gas tanks" at the site, but analysts said satellite photographs showed it happened at a nearby missile production facility
On Sunday officials said there had been a fire at a power plant near the south-western city of Ahvaz
Natanz, about 250km (150 miles) south of the capital Tehran, is Iran's largest uranium enrichment facility
The 2015 nuclear deal saw Iran agree only to produce low-enriched uranium, which has a 3-4% concentration of U-235 and can be used to produce fuel for nuclear power plants
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