The US will not lift its blockade on Iranian ports until a deal has been reached with Tehran, US President Donald Trump has said, amid continuing uncertainty over whether fresh talks to end the war will take place, BBC reported.

The blockade, which began a week ago, is "absolutely destroying Iran", Trump wrote on his social media platform Truth Social, adding his country was winning the conflict "by a lot".

His comments come with the temporary US-Iran ceasefire set to end on Wednesday, but with no certainty over whether a second round of peace talks will go ahead in Pakistan.