A US military blockade of maritime traffic entering and leaving Iranian ports is due to begin in a matter of hours on Monday 13 April.
The US says ships coming or going from elsewhere would be allowed to pass through the Strait of Hormuz, a critical waterway Iran effectively closed in response to US-Israeli strikes.
It comes after negotiators from both sides failed to reach a deal to end the war, which began on 28 February but is currently under a two-week truce.
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