Reuters: Qatari mediators returned to Tehran to review latest developments in negotiations with Argachi Reuters quoted a source familiar with the matter as saying: Late on Monday, Qatari mediators traveled to Tehran to talk with Iranian Foreign Minister Abbas Argachi about a possible deal between the United States and Iran. According to an informed source, a version of the draft agreement between the US and Iran, which has been under negotiation for the past eight days, was discussed in these talks.