Alleged Israeli cyberattack said to strike serious blow to Iranian atomic program; security cabinet to meet next week to discuss recent exchanges with Tehran

Israeli outlets say blackout at Iran's Natanz plant a likely Israeli cyberattack; Western intelligence sources estimate it shut down entire sections of the facility

Comment comes amid reports of apparent cyberattack on Iranian nuclear site, last week's reported Israeli commando raid on Iranian command ship in Red Sea

State TV provides few details about electrical problem; on Saturday, Rouhani inaugurated cascades of IR-6s and IR-5s at same plant, in open breach of nuclear deal

Amid Vienna talks and new IAEA report indicating nuke violations, Rouhani inaugurates new centrifuges at Natanz uranium enrichment plant

Tehran again breaches accord's limits on its uranium enrichment, Reuters reports, as its representatives negotiate return to deal with world powers in Vienna

Announcement of further violations of nuclear deal comes a day after Washington and Tehran begin indirect talks aimed at getting agreement back on track

Speaking at official Holocaust Remembrance Day ceremony, PM says even Israel's 'best friends' must accept that Jewish state is obligated only to defending itself

Washington and Tehran open indirect discussions on 2015 accord; both sides, and European mediators, issue cautious praise of initial efforts; Iran still insists on sanctions relief

Washington will indirectly communicate with Tehran in negotiations in Vienna; neither side appears willing to take first step to begin process back to deal

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