Tehran -Iran said Friday it has begun producing uranium at 60 percent purity, in another breach of its commitments to the international community which is concerned about its nuclear programme. The Islamic republic had declared it would sharply ramp up its enrichment of uranium on Tuesday, two days after an attack on its Natanz nuclear facility that it blamed on arch-foe Israel. The announcement cast a shadow over talks in Vienna aimed at salvaging the 2015 nuclear deal between Iran and world powers that then US president Donald Trump abandoned almost three years ago.