FILE - In this April 16, 2015, file photo, Shiite rebels, known as Houthis, chant slogans during a demonstration against an arms embargo imposed by the U.N. Security Council on Houthi leaders, in Sanaa, Yemen. Saudi Arabia shot down a Scud missile early Saturday, June 6, 2015, fired into the Sunni kingdom by Yemen's Shiite rebels and their allies, the country's official news agency reported, marking what could be a major escalation in the monthslong war. A Patriot missile battery shot down the Scud around 2:45 a.m. Saturday around the southwestern city of Khamis Mushait, the official Saudi Press Agency reported. The agency blamed Shiite rebels, known as Houthis, and their allies in forces loyal to former Yemeni President Ali Abdullah Saleh. (AP Photo/Hani Mohammed, File)