U.S. Secretary of State John Kerry looks at daggers as he visits the Mattrah Souq in Muscat November 10, 2014. Iran, the United States and the European Union began an unscheduled second day of talks on Monday over disagreements blocking the resolution of a confrontation over Tehran's nuclear program, U.S. and Iranian officials said. REUTERS/Nicholas Kamm/Pool (OMAN - Tags: POLITICS)