A person with knowledge of the discussions told The Associated Press that the third round of talks between Iran and the United States over Tehran’s rapidly advancing nuclear program have ended.

Iran and the US plan to continue their negotiations on the Iranian nuclear programme in the coming week, Iranian Foreign Minister Abbas Araghchi said this after the third round of negotiations in Oman on Saturday.

The US and Iran made “very serious” progress toward a new nuclear deal during marathon negotiations Saturday in Oman — with both sides exchanging written proposals for the first time and eyeing further talks as soon as next week.