What has the US said about its blockade of Iranian ports?published at 06:27 BST
The US military has published a video showing one of its helicopters above a tanker at sea
The US naval blockade of maritime traffic entering and leaving Iranian ports has been continuing this weekend.
Donald Trump announced the blockade a week ago - less than a day after lengthy talks between the US and Iran in Pakistan failed to reach a deal.
American forces said they would intercept or turn back vessels travelling to or from Iran's coast, regardless of nationality.
The US hopes to put pressure on Iran by restricting its ability to profit from oil exports.
US Central Command (Centcom) said this weekend that it has forced 23 ships to turn around near the Strait of Hormuz since the blockade began.
In a social media post published just an hour ago, Centcom says "the blockade has completely halted economic trade going in to and out of Iran by sea".
However, BBC Verify tracked at least four vessels from Iranian ports that appeared to have crossed the US blockade line.


