"Iran began enriching uranium Monday to 4.5%, breaking the limit set by its 2015 nuclear deal with world powers, semi-official news agencies in the country reported.
The acknowledgement by the spokesman of the Atomic Energy Organization of Iran comes a day after Iran pledged to break the deal's limit of 3.67%.
The decision to ramp up uranium enrichment came less than a week after Iran acknowledged breaking the 300-kilogram (661-pound) limit on its low-enriched uranium stockpile.
Experts warn higher enrichment and a growing stockpile could begin to narrow the one-year window Iran would need to have enough material for an atomic bomb...
The semi-official news agencies ISNA and Fars reported the 4.5% enrichment figure, citing Behrouz Kamalvandi, a spokesman for Iran's nuclear agency.
Kamalvandi separately hinted in a state television interview aired Monday that the country might consider going to 20% enrichment or higher as a third step, if the material is needed.
That would worry nuclear nonproliferation experts, as 20% is a short technical step away from reaching weapons-grade levels of 90%. Kamalvandi also suggested using new or more centrifuges, which are limited by the deal..."