"Tonight, all delegations will leave Geneva, including [US Secretary of State John] Kerry and [Iranian Foreign Minister Mohammad Javad] Zarif. The next round may take place next week, we are working on it," Araghchi said.
The minister added that bilateral meetings on various levels are currently being held, including between the Russian and the Iranian delegations.
The group is negotiating with Iran to reach a comprehensive agreement on Tehran's nuclear program, which has long been a point of concern for the international community.
After repeated delays, the group is now set to sign an agreement with Iran, guaranteeing the peaceful nature of its nuclear program, by July 2015.