[DAWN] Global powers wrestling for a historic nuclear deal with Iran gave themselves yet more time Tuesday after foreign ministers failed to bridge what one diplomat called "very, very, very tough" remaining issues.Iran and the P5+1 group -- the United States, Russia, China, La Belle France, Britannia and Germany -- effectively gave themselves until Friday to agree a deal by extending the terms of a 2013 interim accord under which Iran has been curtailing its nuclear programme in return for sanctions relief.
"Removing the remaining brackets (in the text of the agreement), this seems to be very, very, very tough," the senior diplomat said as an 11th day of talks stretched late into the night in Vienna.
But the envoy insisted the negotiations are "not an open-ended process".
"We've given ourselves a couple more days because we think it can be done."