Ships have again come to a standstill around the Strait of Hormuz after Iran resumes its blockade, with a marine traffic tracking website showing no boats crossing the major waterway.

Ship tracking website MarineTraffic appears to show no vessels currently crossing the strait, although many seem to be anchored around the Gulf - particularly off the coasts of Oman and the UAE.

Some marine traffic had moved through the crucial shipping corridor yesterday but slowed dramatically as Tehran announced that it would close the waterway.

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Several vessels reported being hit by projectiles, and one tanker reported being fired upon by Iranian gunboats on Saturday.

Iran's parliamentary speaker has called the US siege of Iran's ports "foolish" but says progress has been made in talks—despite both countries remaining "far" from a peace deal.

Mohammad Bagher Ghalibaf, who's Iran's chief negotiator and parliamentary speaker, has said its closure of the Strait of Hormuz would not end so long as the US naval blockade remains in place.

But he also notes there are “just” one or two issues on which the two sides disagreed—without saying what they are, nor explaining their significance.

Earlier, Iran's navy said that the continuing US blockade on Iranian ports is a "breach of ceasefire conditions".

As a reminder, earlier this month Iran and the US agreed to a conditional two-week ceasefire, during which they agreed shipping traffic would be allowed through the Strait of Hormuz.

The vital shipping lane has been closed again by Iran, and Iran's navy says it will remain shut until the US blockade of Iranian vessels and ports is lifted.

In its latest statement, the Islamic Revolutionary Guard Corps Navy says statements made by Trump on the Strait of Hormuz "carry no validity."

It is not clear if the statement is referring to specific comments made by the US president.

Meanwhile, President Donald Trump says "very good conversations" are happening with Iran but adds he won't let Tehran "blackmail" the US over the strait. Here's a timeline of US-Iran talks.

A timeline of US-Iran talks

Here’s an overview of negotiations between the US and Iran so far:

28 February: Conflict breaks out after the US and Israel launch strikes on Iran, as diplomatic talks collapse.

6 March: Donald Trump says there will be no deal "except unconditional surrender" of Iran.

21 March: Trump sets a deadline, threatening to target Iran’s energy infrastructure unless it agrees to open the Strait of Hormuz.

23 March: Trump postpones his deadline, citing "productive conversations"—this is followed by a series of further postponements.

7 April: Trump warns “a whole civilisation will die” if the strait is not opened before another deadline.

8 April: Pakistan, acting as mediator, announces a two-week ceasefire between the US and Iran for further talks.

11 April: Senior US and Iranian officials, including Vice-President JD Vance and Iranian Foreign Minister Abbas Araghchi, meet in Pakistan. After 21 hours of back and forth, Washington and Tehran remain far apart on key sticking points.

12 April: Trump announces a blockade of Iranian ports.

17 April: Iran’s Araghchi says the strait will remain open for the rest of the ceasefire. Trump says the US blockade will continue.

18 April: Iran’s Islamic Revolutionary Guard Corps says it will block the strait again. Trump says “very good conversations” are happening, but the US will not be “blackmailed” over the waterway.

Speaking to reporters in the Oval Office on Saturday, US President Donald Trump said that "very good conversations" are happening with Iran, but that he won't let Tehran "blackmail" the US over the Strait of Hormuz.

He described them as acting "a little cute as they have for 47 years".

As a reminder, Trump had earlier said that the US blockade of Iranian ports would continue until "our transaction with Iran is 100% complete".

Trump says the blockade will continue until "our transaction with Iran is 100% complete" while Iran says the strait will remain closed until the US lifts its siege.

"The only bit of light in this darkness… mediators are still exchanging messages," BBC chief international correspondent Lyse Doucet says from Tehran.

Two Iranian gunboats open fire on a tanker in the Strait of Hormuz, while other ships report being hit by "unknown projectiles" over the weekend