Iran's senior envoys left talks in Switzerland on Monday after a marathon negotiating session with the United States, state media reported, as mediators claimed progress towards a definitive US-Iran deal.
The host nation said conditions were set for technical talks to immediately follow, with the sides at the beginning of a 60-day period to secure a long-term settlement.
Last week, Tehran and Washington signed a memorandum of understanding laying the groundwork for the negotiations, after a 40-day war that was followed by weeks of an inconclusive and oft-breached ceasefire.
