Hezbollah leader Hassan Nasrallah, who transformed the Lebanese militant group into a potent paramilitary and political force in the Middle East, was killed in an Israeli airstrike.

Israel says it has killed eight of the nine most senior commanders on Hezbollah’s military wing this year, most of them in the past week. Another 20 leaders of varying ranks were killed in the bombing raid that eliminated Nasrallah and destroyed Hezbollah’s secret subterranean headquarters, according to the Israel Defence Forces.