Iran and the United States exchanged intensified fire on Thursday in a week-long escalation that has all but torn up last month’s truce, though Iran’s release of a US citizen pointed towards a path to avert the resumption of all-out war.

For the first time since a memorandum of understanding paused fighting last month, the United States launched two big waves of air strikes in a single day on Wednesday, mostly on targets near Iran’s southern coast, and kept firing on Thursday.

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Tehran responded with missiles and drones targeted at US military bases in neighboring states, including a barrage at a recently expanded air base in Jordan.

After Tehran resumed its blockade of the Gulf through the Strait of Hormuz, Washington again blockaded Iranian ports from Wednesday.