According to the sources, due to the positive atmospere the talks between two sides may continue in comming days.
The sources have announce that in case of continuation of the positive atomosphere the indirect talks may change into direct ones.
The US President's envoy Steve Witkoff has reportedly said that today's talks have opend a new window in US and Iran interactions.
There was not a lot of information and visibility on what was going on behind closed doors in Muscat.
But Al Jazeera has learned from a source close to the negotiations that both sides were asked to produce a position paper, laying out the areas they think are important for the discussion and their red lines – the things that cannot be discussed and must not be crossed.
Those two papers will then be swapped, so they’ll each get to see the other side’s key position on this.
The Iranian side has said these talks must be limited to the nuclear issue, the source said.
The other thing that we understand relates to the issue of whether these talks will be direct or indirect, with the Omanis going from room to room and speaking with either side, it added.
"Our understanding from the source is that the Iranian side does not have instructions from Tehran to have direct meetings," the source said.
Iran and the United States began high-level talks in Oman on Saturday aimed at jump-starting negotiations over Tehran's fast-advancing nuclear programme, with US President Donald Trump threatening military action if there is no deal.
