The Houthis, a rebel army fighting against Saudi-led interests in Yemen, claimed credit for launching the attacks on Saturday. However, the U.S. government now says it believes the assault was launched from Iran, and that it may have involved cruise missiles rather than drones.The strikes centered on Saudi Arabia’s Abqaiq refinery. Abqaiq is the world’s largest oil refinery, processing about two-thirds of the total Saudi supply each day. Saudi Arabia is the world’s second-largest producer of crude oil behind the United States.Several large Saudi oil fields were also attacked. Those attacks, along with the disruption of the Abqaiq refinery...