Donald Trump says that the US is blockading the Strait of Hormuz. What does this mean in practice?

Lyse Doucet speaks to Ebrahim Azizi, who says Iran "will decide the right of passage" through the crucial shipping route.

The BBC's Lyse Doucet reports from Tehran as tensions continue over the Strait of Hormuz.

Energy markets have seen wild swings since the US and Israel attacked Iran on 28 February.

Verified video shows an Iranian drone hitting a warehouse in Kuwait

Trump's comments aired as the two countries exchanged fire for the fourth day in a row and the US resumed blockading Iranian ports.

Control of the waterway has become a key point of contention between the US and Iran, as a ceasefire deal falters.

Iran has repeatedly restricted access to the Strait of Hormuz, one of the world's busiest oil shipping channels.

On Monday, President Donald Trump said the US was reinstating a naval blockade of Iranian ports and would impose a 20% charge on all cargo shipped through Hormuz

The third consecutive night of US strikes on Iran came as Trump announced a 20% charge as part of a new blockade on the Strait of Hormuz.

Overnight, the US hit a submarine and Iranian ship maintenance facility, in response to Iran targeting commercial ships in the strait.

Within hours of the latest US attacks, Iran said it had struck US military assets in Kuwait, Jordan, Bahrain and Oman.

Iranian forces earlier said the Strait was closed and launched wide-ranging attacks at US allies and bases in the region.

US media say Iran has told US officials an attack on ships crossing the strait early this week was "a mistake".

Ali Khamenei was buried at the Imam Reza shrine, Iran's holiest Shia Muslim site, ending six days of public mourning ceremonies.

This week has seen the worst exchange of strikes between the US and Iran since the ceasefire agreement.