IRNA reporters in Vienna said that the meeting will resume on Sunday. Of course, the deputy foreign ministers have to make some changes on the context of the deal prior to the ministerial meeting.

Deputies Foreign Minister Abbas Araqchi and Majid Takht-e Ravanchi, along with Deputy EU Foreign Policy chief Helga Schmid, US Undersecretary of State Wendy Sherman and Obama's special aide Robert Malley are working on the context of the deal from early morning.

If the deputy foreign ministers come to terms, Iranian and U.S. foreign ministers and Ms. Mogherini will go ahead with negotiations.

While deputy ministers are working on the text, Director General of the International Atomic Energy Organization Yukiya Amano arrived in Vienna's Coburg hotel on Sunday afternoon to join the talks on Iran nuclear program.

Russian Foreign Minister Sergei Lavrov is also on way to Vienna to join the negotiations.

Yukiya Amano after arriving held a meeting with head of Atomic Energy Organization of Iran (AEOI) Ali-Akbar Salehi in Vienna's Coburg hotel on Sunday evening.