From left, US Secretary of State John Kerry, Iranian Foreign Minister Javad Zarif and European Union High Representative for Foreign Affairs and Security Policy Federica Mogherini arrive to deliver a statement, at the Swiss Federal Institute of Technology, or Ecole Polytechnique Federale De Lausanne, in Lausanne, Switzerland, Thursday, April 2, 2015, after Iran nuclear program talks finished with extended sessions. (AP Photo/Brendan Smialowski, Pool)