The talks, aimed at bringing Iran and the United States back into compliance with the nuclear deal, will pick up again next week based on the progress achieved so far, diplomats say.
While 60 percent enrichment is higher than any level Iran previously enriched uranium, it is still lower than weapons-grade levels of 90 percent. The 2015 nuclear deal limited Iran’s enrichment to 3.67 percent.
Mohsen Fakhrizadeh was killed in an attack in Absard, a small city east of Tehran, reports say, while Foreign Minister Javad Zarif claims "serious indications" of Israel's role in assassination.
Britain, France, Germany, China and Russia are struggling to save the landmark 2015 accord with Iran, which has been progressively stepping up its nuclear activities since the US pulled out of the deal in 2018.
Iran's supreme leader has responded by ruling out negotiations with the US over Tehran's ballistic missile and nuclear programmes and urging Iranians to resist pressure.
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