The Killing of Iran’s Supreme Leader and the End of an Era in the Middle East

The United States and Israel on Saturday launched an attack against Iran, killing the nation’s supreme leader, Ayatollah Ali Khamenei, and, according to Iranian state media, several people in the country’s leadership structure. The New York Times journalists Mark Mazzetti and David E. Sanger explain what is next for Iran, and what these strikes threaten to unleash.