VIENNA (Sputnik) — The group is set to hold talks with representatives of the Islamic Republic later on Monday, according to the source.
"The P5+1 consultations continued with the participation of Iran," the source said.
Representatives of the P5+1, comprising the United States, Russia, China, France, the United Kingdom and Germany, met for talks without Iran, coordinated by EU foreign policy chief Federica Mogherini, earlier in the day.