Top diplomats from Iran and the United States held "substantive" talks today aimed at speeding up negotiations for a nuclear deal, with US Secretary of State John Kerry heading back for a surprise new round.
State Department officials said the talks with Kerry and his Iranian counterpart Mohammad Javad Zarif had ended about 6:00pm (1700 GMT) after about five hours.
But 90 minutes later the two men were set to hold another surprise meeting at an upscale Geneva hotel, a senior State Department official said.
They are seeking to break a stalemate which has caused them to miss two previous deadlines for a full agreement to rein in Iran's suspect nuclear programme.
Zarif told reporters Wednesday's talks were "important."
"I think it will show the readiness of the two parties to move forward to speed up the process."
But asked if there would be a comprehensive deal by the new July 1 deadline, he remained cautious replying: "We'll see."
A senior State Department official said: "They had substantive meetings for approximately five hours today and they discussed a broad range of issues with a small group of staff from each side."
Kerry then briefed his negotiators before lower level US-Iran bilateral talks here tomorrow, ahead of Sunday's discussions with the whole P5+1 group -- Britain, China, France, Germany, Russia and the United States.
Kerry and Zarif even moved their discussions outside, leaving the hotel for a brief stroll around Geneva city centre, causing some consternation for their security teams.
But in a surprise move, Kerry headed back to the hotel to meet with Zarif again.
Past negotiations have stumbled reportedly over Iran's insistence that it retain the right to enrich some uranium -- which can in some cases be used to make an atomic bomb -- for what it says is a peaceful civilian nuclear programme.
There has also been disagreement over global sanctions, with Tehran calling for an end to an iron-clad regime which has crippled Iran's economy, while the US has insisted on a temporary, gradual suspension.
Negotiators have been tight-lipped about their differences and Zarif would not go into detail when asked about the thorniest matters still clouding the talks.
"All issues are hard until we resolve them and all issues are easy if you resolve them," he told reporters travelling with Kerry.
