World powers seeking to pin down a nuclear deal with Iran will hold their first full session of these negotiations tomorrow, a senior Iranian official said.
Tehran's lead negotiator Abbas Araqchi said the full plenary session would now be held tomorrow morning, after being pushed back today.
"Tomorrow morning there will be a plenary meeting," Araqchi told reporters.
"Getting to an accord is doable. Solutions have been found for numerous questions. We are still working on two or three issues... The talks are in their final phase and are very difficult," he added.
US Secretary of State John Kerry and the German and French foreign ministers Frank-Walter Steinmeier and Laurent Fabius were due to sit down with Chinese foreign minister Wang Yi and EU foreign policy chief Federica Mogherini as well as their Iranian counterpart Mohammad Javad Zarif.
They will be joined by Russian foreign minister Sergei Lavrov and his British counterpart Philip Hammond, who was the last to arrive late today.
