“Tonight or tomorrow (Sunday) another round of talks will likely be held,” the source noted.

Earlier, Tasnim’s correspondent in Islamabad said on Saturday night that one phase of the face-to-face negotiations has ended, noting that the two delegations were exchanging texts.

He said the expert teams of the Iranian and American negotiating delegations, who had been engaged in talks for several hours on Saturday, after concluding one phase of in-person discussions, were exchanging written texts concerning the topics under discussion.