00:00 The US military has begun a blockade of all traffic coming and going from Iranian ports in the Strait of Hormuz.
US President Donald Trump decided on the move after peace talks with Iran failed to secure an agreement over the weekend.
02:34 While we don't know where the US ships are located, this is what we know about the blockade so far.
03:14 ABC Correspondent Tim Swanston reports from Dubai on whether any ships have been boarded or turned around as part of the blockade.
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