United States forces have said they carried out attacks in southern Iran, describing the attacks as “self-defence” operations as top Iranian officials have travelled to Qatar for talks.

Earlier, Iranian media reported explosions in the southern port city of Bandar Abbas, a strategic hub near the Strait of Hormuz, a global chokepoint through which a fifth of global oil and gas passes.

Tehran has cautioned against expectations of a rapid breakthrough, with Iran’s Foreign Ministry spokesman on Monday saying progress had been made in the negotiations, but stressed that it does not mean a deal is “imminent”.

Here is what we know: