The US and Israel launched wide-ranging strikes against Iran on 28 February, sparking conflict across the Middle East.
Iran responded by attacking Israel and US-allied states in the Gulf, and effectively closed the Strait of Hormuz shipping channel, which sent global oil prices soaring.
A ceasefire was agreed on 8 April which has largely been observed by both sides, but talks to resolve the conflict had stalled in recent weeks.
By Tuesday, the US had launched what it called “self-defence strikes” against southern Iran – which Tehran denounced as a “gross violation” of the ceasefire agreed in early April.
On Monday, the US launched strikes against Iranian missile sites and boats which it said were attempting to place mines.
It said the strikes were carried out in self-defence and designed “to protect our troops from threats posed by Iranian forces”.
Tehran denounced them as a “gross violation” of the ceasefire.