Iran's UN envoy, Amir Saeid Iravani, says Tehran reserves its right to defend itself and hit any threat coming from Israel "wherever and whenever it deems necessary".
Iran has been adding them to two underground sites at Natanz and Fordow, which may be designed to withstand potential aerial bombardment.
Tehran's decision to move the facility comes as diplomatic efforts to restore Iran’s tattered nuclear deal appear stalled.
While 60 percent enrichment is higher than any level Iran previously enriched uranium, it is still lower than weapons-grade levels of 90 percent. The 2015 nuclear deal limited Iran’s enrichment to 3.67 percent.
Tehran says 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.
Foreign Minister Javad Zarif says the sabotage at the Natanz nuclear facility negatively impact atomic deal talks in Vienna where Russia is putting on a united front with Iran against the US and Europe.
It's clear that Israel does not want the Iran nuclear deal to be salvaged, but provocations may speed up re-negotiation.
Iran’s Natanz reactor’s new centrifuges were targeted in an Israeli cyberattack.
Tehran’s move is the latest of many taken to raise pressure on US President Joe Biden as the two sides remain locked in a stand-off over who should move first to salvage the 2015 nuclear deal abandoned by the Trump administration.
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