High-level Iranian and US officials meeting in Switzerland have concluded their first round of talks, with mediators saying both sides agreed on a roadmap towards a final deal aimed at ending their more than 100-day war.

Mediators Pakistan and Qatar said the negotiations, held in Burgenstock, produced agreement on a 60-day framework for a final settlement, along with continued technical talks throughout the week.

They said a communication mechanism would be established to keep the Strait of Hormuz open and prevent incidents, alongside a “deconfliction cell” to reduce the risk of renewed fighting in Lebanon.

The talks, led by US Vice President JD Vance and Iranian parliament Speaker Mohammad Bagher Ghalibaf, followed a preliminary understanding reached last week.

Mediators described “encouraging progress”, saying working groups would begin immediate technical discussions, though key details of their mandate remain unclear.

The discussions come amid continued tensions in Lebanon and the wider region, where clashes between Israel and Hezbollah have persisted since the war began.

Iranian Foreign Minister Abbas Araghchi said the talks delivered “major progress”, including steps toward easing restrictions on energy exports, releasing frozen assets, and advancing reconstruction plans, while emphasising the establishment of a Lebanon deconfliction mechanism.

However, Iranian and US negotiators briefly faced setbacks after tensions escalated over US President Donald Trump’s warnings of further strikes against Iran over its support for Hezbollah, prompting a temporary walkout by the Iranian delegation.

Despite this, both sides returned to the table and agreed to continue technical negotiations, which mediators said reflected “constructive engagement”.

The war has seen repeated escalations involving Israel, Hezbollah, and Iran-aligned forces in Lebanon, where more than 4,100 people have been killed since March, according to the Ministry of Public Health.

Further negotiations are expected to continue over the coming days at the Swiss resort.