Upping the ante

From Iran Nuclear Chief: Some Enrichment Centrifuges Blew Up:

The Chief of Iran's atomic agency, Gholam-Reza Aqazadeh, on Tuesday confirmed press reports that some of the centrifuges at its nuclear enrichment plant blew up during the enrichment process, with damage ranging from 10 to 20%. He also said, "The uranium enrichment plant in Natanz has been constructed for establishing a factory for 50,000 centrifuges, but it would take between two to four years for install all these centrifuges."

The IAEA confirmed the installation of around 1,000 centrifuges in six cascades with 164 centrifuges each, although it was unclear whether all six cascades were fully operational. Aqazadeh claimed that all the centrifuges were made in Iran.