Iran blamed Israel on Monday for a sabotage attack on its underground Natanz nuclear facility that damaged its centrifuges, an assault that imperils ongoing talks over its tattered nuclear deal and brings a shadow war between the two countries into the light. Israel has not claimed responsibility for the attack. It rarely does for operations carried out by its secret military units or its Mossad intelligence agency. However, Israeli media widely reported that the country had orchestrated a devastating cyberattack that caused a blackout at the nuclear facility. Meanwhile, a former Iranian official said the attack set off a fire. The attack further strains relations between the U.S., which under President Joe Biden is now negotiating in Vienna to re-enter the nuclear accord, and Israel, whose Prime Minister Benjamin Netanyahu has vowed to stop the deal at all costs. Netanyahu met Monday with U.S. Defense Secretary Lloyd Austin, whose arrival in Israel coincided with the first word of the attack. At a news conference at Israel’s Nevatim air base Monday, where he viewed Israeli air and missile defense systems and its F-35 combat aircraft, Austin declined to say whether the Natanz attack could impede the Biden administration’s efforts to re-engage with Iran in its nuclear program