Catherine Ashton, Laurent Fabius, Philip Hammond, Mohammad Javad Zarif

nuclear talks vienna

Former EU foreign policy chief Catherine Ashton, left, British Foreign Secretary Philip Hammond, third left, Iranian Foreign Minister Mohammad Javad Zarif, rear center, and French Foreign Minister Laurent Fabius, second right, wait for the start of closed-door nuclear talks with Iran in Vienna, Austria, Friday, Nov. 21, 2014. (AP Photo/Ronald Zak)

Former EU foreign policy chief Catherine Ashton, left, British Foreign Secretary Philip Hammond, third left, Iranian Foreign Minister Mohammad Javad Zarif, rear center, and French Foreign Minister Laurent Fabius, second right, wait for the start of closed-door nuclear talks with Iran in Vienna, Austria, Friday, Nov. 21, 2014. (AP Photo/Ronald Zak)

Clock ticks down on Iran nuke talks’ deadline