Al Jazeera’s Osama bin Javaid reports from Buergenstock that talks between the US and Iran are taking place in a “constructive atmosphere”.

“What we know is that this is going to be choreographed into multiple sessions, themed around the major sticking points,” he adds. “The first session was on Lebanon, and now a session on the Strait of Hormuz and a third session on the nuclear issue and sanctions on Iran.”

Bin Javaid says he has spoken to “a number of sources” and witnessed Iranian Foreign Minister Abbas Araghchi speak to Qatar’s prime minister before walking out.

“As soon as journalists were cleared from the room, the Iranian delegation came back inside. It appears the Iranians did not want to appear in front of the media,” bin Javaid reports.

“What we’ve heard is that the talks are carrying on in a constructive atmosphere, despite the tweets you’ve seen in the last hour or so from the US president. It is the first day, the first step toward these high-profile meetings. The first session is over, but all four teams are back in their rooms, and they’ll continue throughout the day.”