Iran to Begin 60 Percent Uranium Enrichment After Nuclear Site Incident DUBAI—Iran said on Tuesday it will start enriching uranium to 60 percent purity, a move bringing the fissile material closer to levels suitable for a bomb, after accusing Israel of sabotaging a key nuclear installation. The disclosure came soon before the resumption of talks in Vienna aimed at reviving Iran’s 2015 nuclear deal with major powers, an accord Israel fiercely opposed, after former U.S. President Donald Trump withdrew from it three years ago. A fissile purity of 90 percent is suitable for a nuclear bomb. Announcing 60 percent enrichment, chief nuclear negotiator Abbas Araqchi also said Iran would activate 1,000 advanced centrifuge machines at Natanz, a nuclear plant hit by an explosion on Sunday that Tehran called an act of sabotage by Israel.