Talks on reviving the 2015 Iran nuclear deal will resume on Thursday in Vienna, a senior European Union official has said, after negotiations ended without results last Friday.

"The 7th round talks will continue tomorrow Thursday in Vienna after consultations in and among capitals," Enrique Mora, who is chairing the talks, said on Twitter. "A Joint Commission and a number of bilateral and multilateral contacts will take place."

State-controlled media in Iran announced Tuesday that talks will resume on Thursday, but Mora's announcement is the first confirmation by Western diplomats.

Talks resumed on November 29 after a five-month hiatus following Iran’s presidential elections in June. Iran had delayed its return to the talks, while continuing to enrich uranium, causing serious concern in Western capitals. However after five days of negotiations talks adjourned Friday without any results, as Iran presented new demands.

France's foreign minister had said on Wednesday the talks were likely to continue, although he added that he feared Iran was playing for time.