Iran has continued to ramp up its nuclear capabilities in the last three months. New reports show Iran's main uranium enrichment facility has tripled their installations of high-tech machines to more than 600.
Diplomats said the the machines are not yet producing enriched uranium but fear they could be used in a nuclear weapons program.
Iran's nuclear Chief has announced more than 3,000 of the high-tech centrifuges have already been produced.
"It is clear Iran can build them. The question is how many and how good are they," one Western envoy said. Production depends on whether they have all the parts and materials required.
"It is possible that they have accumulated an inventory of these things," said nuclear expert Mark Hibbs of the Carnegie Endowment think-tank said.
And if hundreds of new centrifuges have been installed, another expert says it means Iran has made "a significant breakthrough both in mastering the technology and in acquiring the raw materials."
If true, the numbers disprove a US source which argued the Islamic regime would not have enough raw materials.