“Despite some stories on social media that a plane had landed in Islamabad, Pakistan, and an Iranian official had joined the negotiations, no (new) person has joined the negotiations and such claim is merely a rumor,” Tasnim correspondent dispatched to Islamabad said Sunday.

Earlier, Marathon meetings between the Iranian and the US negotiators concluded after 15 hours and the talks are going to be held on Sunday for the second consecutive day.

Iranian officials began talks at 13:00 local time on Saturday at the Serena Hotel in Islamabad, Pakistan, first with Pakistani officials and then with the American delegation.

The marathon of talks continued until 3:40 am local time on Sunday.

The talks are scheduled to continue for a few more hours on Sunday.

Tasnim reporter dispatched to Islamabad reported that “given the unreasonable demands made by the American side and the Iranian delegation's insistence on preserving national interests, with the proposal of the Pakistani side and the acceptance of both sides, the talks will continue for another round on Sunday.