DUBAI, United Arab Emirates—Iran blamed Israel on Monday for an attack on its underground Natanz nuclear facility that damaged its centrifuges. Israel has not claimed responsibility for the attack, but Israeli media widely reported that the country had orchestrated a devastating cyberattack that caused a blackout at the nuclear facility. Israeli officials rarely acknowledge operations carried out by the country’s secret military units or its Mossad intelligence agency. While the nature of the attack and the extent of the damage at Natanz remains unclear, a former Iranian official said the assault set off a fire while a spokesman mentioned a “possible minor explosion.” The United States, which under President Joe Biden, is now negotiating in Vienna to re-enter the nuclear accord, and Israel’s 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 …