Two days after the June 30 deadline, top negotiators involved in Iran's nuclear talks will attempt to confront political issues holding them back from a deal, European Union foreign policy chief Federica Mogherini said Thursday."We're moving forward, but we're not there yet," Mogherini told reporters here. "Today we will have the chance of checking some political issues that are still open," she added.

She noted the visit of Yukiya Amano, director general of the International Atomic Energy Agency (IAEA), to Teheran "is something very important."

US State Department deputy spokeswoman Marie Harf announced Tuesday that fresh rounds of nuclear talks would take place June 30 to July 7.

Iran and the P5 plus 1 group -- the United States, Britain, France, Russia, China, and Germany -- agreed on a framework of understanding in April, and set June 30 as the deadline for concluding a final deal, after missing two previous deadlines in June and November.