Media sources said on Monday morning that representatives from Iran and the Group 5+1 (the five permanent UN Security Council member states plus Germany) have started negotiations to specify a proper date for the next round of talks in Istanbul, Turkey, FNA reported.
'The Nuclear Iran' internet website said officials of the two sides have made contacts on Sunday and exchanged views over the proper dates for holding the next round of negotiations.
"Yet, discussions over the date of the talks will most likely remain open until the upcoming visit to Washington by Turkish Foreign Minister Ahmet Davutoglu and his meeting with US Secretary of States Hillary Clinton," the site said.
Senior negotiators from Iran and six world powers attended three sessions on December 6-7 in a new round of multifaceted talks in Geneva, Switzerland.
The two sides agreed at the end of their third session to hold the next round of talks in Istanbul late in January.
Diplomatic sources said after the talks that the next round of negotiations will be aimed at "talks for cooperation" and "finding common grounds for cooperation".