"Over the course of the evening, we continued to make progress as we worked to narrow the gaps," a senior State Department official said late yesterday.
"There is more work to do. The meetings will resume tomorrow morning," the official added after US Secretary of State John Kerry met for some five hours late yesterday with his Iran counterpart Mohammed Javad Zarif and EU foreign policy chief Catherine Ashton.
Russian Foreign Minister Sergei Lavrov is due to fly in today to join most of his counterparts from the five permanent members of the UN Security Council, plus Germany -- with France's Laurent Fabius, Germany's Guido Westerwelle and Britain's Wiliam Hague already in town.
Ashton refused to answer any questions, while Kerry said that there had been "a lot of work" done during their talks.
Iran's lead negotiator in Geneva, Deputy Foreign Minister Abbas Araqchi said: "The meeting was productive, but we still have lots of work to do."
He also confirmed the meeting would continue today.
