Iran preparing to enrich uranium, nuclear deal talks in Vienna told

Tehran accuses Israel of trumpeting lies to poison' talks aimed at reviving 2015 pact

Iran sought to heighten pressure on western negotiators in Vienna through increasing its use of advanced centrifuges as talks on reviving the 2015 nuclear deal carried on for a third day on Wednesday.

The International Atomic Energy Agency reported on Wednesday that Iran had started the process of enriching uranium to up to 20% purity with one cascade, or cluster, of 166 advanced IR-6 machines at the Fordow fuel enrichment plant, which is about 20 miles north-east of Qom. Those machines are far more efficient than the first-generation IR-1.