There was no sign Iran was lifting its near-total blockade of the strait, which has caused the worst-ever disruption to global energy supplies. Tehran cited Israel's ongoing attacks on Lebanon, which included the heaviest strikes of the conflict on Wednesday, as a key sticking point.

US President Donald Trump said in a social media post late Thursday that Iran was doing a "very poor job" of allowing oil to go through ​the strait. In a separate post, he said oil would start flowing again, without saying what actions the US might take.

In the ​first 24 hours of the ceasefire, which Trump announced on Tuesday, just a single oil products tanker and five dry bulk carriers sailed through the strait, which typically carries a fifth of the world's oil and liquefied natural gas flows and 140 ships a day before the conflict.