FILE- Abbas Araghchi, Iranian foreign minister, and Qatari foreign minister and prime minister Mohammed bin Abdulrahman bin Jassim Al Thani held a meeting in Doha. Photo courtesy of Mehr news agency.
"Separate preparatory meetings with each side will now take place in Doha this week, ahead of the official signing in Switzerland and the start of the technical talks," the diplomat said, speaking on condition of anonymity to discuss the sensitive arrangements.
The source added that Qatari mediators had departed Tehran after "17 hours of intensive negotiations", which began on Sunday and culminated in an agreement being reached.
The United States and Iran said they reached a deal to end the Middle East war on all fronts including Lebanon, and reopen the vital Strait of Hormuz, but offered little indication on the thorny question of Tehran's nuclear programme.
Pakistan first announced the deal, with Prime Minister Shehbaz Sharif saying: "Both sides have declared the immediate and permanent termination of military operations on all fronts, including in Lebanon."
He added thanks to leaders of Qatar, Saudi Arabia and Turkey for their support in the mediation effort.
Few of the details were made public, but US President Donald Trump said the Strait of Hormuz -- a key conduit for global oil supplies -- would reopen after the planned signing of the deal on Friday.
Washington and Islamabad said the agreement was to be signed on Friday in Switzerland, signalling what would be a major breakthrough to ending months of war that have taken thousands of lives and roiled energy markets.
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