"They are to resume ", the source said, adding that "some gaps" were narrowed earlier today.
Representatives of Iran and the P5+1, comprising the United States, Russia, China, France and Germany, are currently in Geneva to take part in the latest round of negotiations on Iran’s nuclear program.
Several bilateral meetings were held on Monday, including between the representatives of Russia and Iran.
The Islamic Republic’s nuclear activities have long been a point of concern for the international community, with several states suspecting that Tehran may be using its civilian nuclear program as a cover for developing weapons.
After repeated delays, the P5+1 group and Tehran are now set to sign an agreement guaranteeing the peaceful nature of Iran’s nuclear program by July 2015.