Iran has deepened a key breach of its 2015 nuclear deal, enriching uranium with a larger number of advanced centrifuge machines in an underground plant as it faces off with the new U.

Iran deepens breach of nuclear deal at underground enrichment site

The European Union voiced concern Tuesday at Iran's announcement that it would resume uranium enrichment at an underground plant, warning it is getting harder to preserve the 2015 nuclear deal.

European Union 'concerned' by Iran nuclear enrichment announcement

Iran from Friday, September 6 will begin developing centrifuges to speed up the enrichment of uranium, as the next step in scaling back its nuclear commitments, President Hassan Rouhani said on Wednesday, September 4. Watch this video to know more.

Iran to develop centrifuges from Friday