DUBAI, United Arab Emirates—A problem with the electrical distribution grid at Iran’s Natanz nuclear facility caused an incident at the site on April 11, Iranian Press TV reported, a day after Tehran launched new advanced uranium enrichment centrifuges at the site. The Natanz facility, which is located in the desert in the central province of Isfahan, is the centerpiece of Iran’s uranium enrichment program and monitored by inspectors of the International Atomic Energy Agency, the U.N. nuclear watchdog. “The incident caused no casualties or contamination,” Iran’s Atomic Energy Organization spokesman Behrouz Kamalvandi said, adding that “electricity was affected at the Natanz facility.” The cause is under investigation, Kamalvandi told Iran’s semi-official Fars news agency; Iranian lawmaker Malek Shariati-Niasar said in a tweet, “This incident … is strongly suspected to be sabotage or infiltration.” Iran has blamed Israel for last year’s killing of Mohsen Fakhrizadeh, who was believed by Western intelligence …