DUBAI, United Arab Emirates — Israel attacked a key petrochemical plant at Iran’s massive South Pars natural gas field and killed a top Revolutionary Guard commander, putting into question the negotiations aimed at getting the U.S. and Tehran to reach a ceasefire.

Israel’s Defense Minister Israel Katz confirmed what he called “a powerful strike on the largest petrochemical facility in Iran” that’s responsible for half of the country’s petrochemical production. Israel’s military spokesperson, Lt. Col. Nadav Shoshani, said there would be “no immunity” for Iran as talks progress.