Despite optimistic statements from US officials, negotiations between Washington and Tehran remain fragile amid deep mistrust and regional tensions.

Iran and the United States concluded a round of indirect talks in Doha, mediators said on Thursday, as efforts continued to advance negotiations and lower tensions following recent exchanges of fire.

In June, Washington and Tehran agreed on a memorandum of understanding, brokered by Qatar and Pakistan, which included a 60-day ceasefire pausing the war that broke out with US-Israeli strikes in late February, as well as the reopening of the blockaded Strait of Hormuz.

But the 14-point deal also set a timeline for talks to permanently end the war and settle issues like arrangements for Hormuz, reconstruction funding for Iran and the future of the Islamic republic's nuclear programme.

Here is what we know about the latest round of discussions: