There were no reports of attacks on UK-linked ships on Saturday, the Ministry of Defence and Department for Transport say, following Trump's claim a UK cargo ship was shot at in the Strait of Hormuz.

"Iran decided to fire bullets yesterday in the Strait of Hormuz — A Total Violation of our Ceasefire Agreement! Many of them were aimed at a French Ship, and a Freighter from the United Kingdom," Trump said on social media.

There were two reports of ships - a tanker and cargo ship - being attacked in the strait on Saturday, according to UKMTO, which gave no further information on which nations the vessels were linked to.

India's Foreign Secretary Vikram Misri said on Saturday that two Indian-flagged ships were involved in a shooting incident in the area.

This won't be the first time negotiators from the US and Iran have met in Pakistan for peace talks.

Just a week ago, US Vice-President JD Vance announced he was taking his delegation home from Islamabad without a deal.

As both sides left empty-handed, they blamed each other for the failure.

After 21 hours of discussions, Vance said: "we just could not get to a situation where the Iranians would accept our terms."

Meanwhile Iran's Parliament Speaker Mohammad Bagher Ghalibaf, who led his side in the negotiations, suggested the US "failed to gain the trust of the Iranian delegation".

Later, a US official said that the two sides did not reach an agreement on what to do with the Iranian regime's enriched uranium.

Other unresolved issues, according to the official, included reopening the Strait of Hormuz without toll charges, and securing a commitment from Iran to stop funding proxy groups like Hezbollah and Hamas.

Preparations are already under way in Pakistan after US President Donald Trump said a new round of Middle East talks will take place in Islamabad.

Here's the scene in the Pakistani capital, as we await confirmation of who will make up the US delegation for talks with Iran.

Image source, Reuters

Image source, AFP via Getty Images

Image source, Reuters

Carrie Davies
BBC Pakistan correspondent reporting from Islamabad

Image source, Reuters

Even before President Trump's social media post, Islamabad was already starting to lock down.

Guests at the hotel where the talks took place between the US and Iranian delegations last weekend were told they needed to leave.

Three universities have moved their classes online.

Islamabad police announced that due to the arrival of foreign delegations key roads into the city may be closed with heavy traffic completely restricted from entering the city; traffic has already built up around the edges of the city.

The city is preparing.

The US president has described Iran's efforts to close the Strait of Hormuz as "strange" because the US blockade "has already closed it".

The American naval blockade hasn't specifically barred passage of ships in the strait - so let's break down what each side has said about their restrictions.

Iran

Iran’s Supreme National Security Council, the country’s top security body, said on state TV on Saturday that Tehran is "determined to enforce monitoring and control over transit through the Strait of Hormuz until the definitive end of the war and the establishment of lasting peace in the region".

The statement says this will be done by collecting full information from vessels passing through, issuing transit certificates, and requiring payment of service fees for "security, safety, and environmental protection services".

US

When Trump first announced the US blockade, he said it would apply to "any and all ships trying to enter, or leave, the Strait of Hormuz". He also said he had instructed the navy to "interdict every vessel" in international waters that pays a toll to Iran to pass the strait.

But the US military's description of how the US blockade was worded differently - focusing on blockading Iranian ports, and not restricting passage through the strait for others. It said it would not "impede freedom of navigation for vessels transiting the Strait of Hormuz to and from non-Iranian ports".

Iranian Foreign Ministry spokesman Esmail Baghaei has criticised the US blockade of Iranian ports as a violation of the ceasefire agreement, adding it is "unlawful and criminal".

In a post on social media, Baghaei cites an article from the UN Charter and a UN resolution which he says prohibit the blockading a country's ports and coastline.

Baghaei accuses the US of committing a war crime by "deliberately inflicting collective punishment on the Iranian population", describing it as a "crime against humanity".

More from Donald Trump's social media post, where he accuses Iran of a "Violation of our Ceasefire Agreement" after it "decided to fire bullets yesterday in the Strait of Hormuz".

"That wasn’t nice, was it?" Trump writes, saying the shots were "aimed at a French Ship, and a Freighter from the United Kingdom".

The US president calls Iran's decision to close the strait "strange", as he says the US blockade has "already closed it".

"They’re helping us without knowing, and they are the ones that lose with the closed passage, $500 Million Dollars a day! The United States loses nothing," he suggests.

Iran has also accused the US of breaching ceasefire conditions by imposing a naval blockade on Iranian ports.

Note: Iran's closure of the Strait of Hormuz and the US naval blockade are different - we will explain more in a coming post.

Image source, EPA

We've just had an update from US President Donald Trump.

"My Representatives are going to Islamabad, Pakistan - They will be there tomorrow evening, for Negotiations," he writes on social media.

"We’re offering a very fair and reasonable DEAL, and I hope they take it because, if they don’t, the United States is going to knock out every single Power Plant, and every single Bridge, in Iran," he adds.

Warning there will be "NO MORE MR NICE GUY" if talks fail, Trump says these bridges and power plants will "come down fast, they’ll come down easy".

We’ll bring you more from his social media post soon.

A snapshot of the Marine Traffic website taken just before 12:00 GMT (13:00 BST) shows no traffic moving through the Strait of Hormuz.

About 20% of the world's oil and liquefied natural gas (LNG) usually passes through the strait, but the number of ships transporting this has dramatically decreased during the recent hostilities in the Middle East.

On Friday Iran's foreign minister said the Strait of Hormuz had reopened for commercial vessels, but this decision was reversed a day later.

Iran now says the strait will remain closed until the US ends its blockade on Iranian ports.

Image source, MarineTraffic

Image source, NetBlocks

Academics will be reconnected to the international internet in Iran, the country's science ministry has said.

Mehdi Abtahi, the deputy minister for science and research, says that a list of names of university professors has been provided to the Ministry of Communications and they will gradually be connected, BBC Persian reports.

A government imposed internet blackout has been in place in Iran for 51 days, according to internet monitoring site NetBlocks.

Currently, only a small group known as white SIM card holders, along with some government supporters, have access to the internet.

BBC Persian is the Persian language service of BBC News, used by 24 million people around the world - the majority in Iran - despite being blocked and routinely jammed by Iranian authorities.

Strait of Hormuz at a standstill until the US and Iran agree on talkspublished at 12:13 BST 19 April

12:13 BST 19 April

Frank Gardner
Security correspondent

There is in effect a double blockade in the Strait of Hormuz.

The Iranians say they are targeting any shipping trying to get through the vital waterway while the Americans are imposing their naval blockade on all Iran’s Gulf ports.

In normal times you have about 140 ships passing both ways through the Strait to collect oil, gas, fertiliser and other products.

But only a trickle of ships has been getting through since the conflict started.Iran is insisting all maritime traffic goes up a new route set by them to be inspected by the Islamic Revolutionary Guard Corps Navy and in some cases pay a toll.

That is unacceptable to the international shipping community.

It would be like imposing a toll on the English Channel so any ships coming down from the North Sea would have to stop off at Folkestone or Calais and be inspected.

The distance of the waterway is the same as the English Channel at the shortest navigable part of the Strait of Hormuz.

Everything has ground to a standstill until the US and Iran agree on talks.

Ghoncheh Habibiazad
Senior reporter, BBC Persian

The IRGC (Islamic Revolutionary Guard Corps) affiliated Tasnim News Agency has said that “following the continuation of Iran’s naval blockade, Iranian armed forces today turned back two additional oil tankers from passing through the Strait of Hormuz” on Sunday.

Tasnim says that these two tankers, “sailing under the flags of Botswana and Angola”, wanted to transit through Hormuz but were “forced to change course and retreat due to the timely action of the armed forces of Iran”.

It follows the Iranian announcement that the Strait of Hormuz will remain closed until the US lifts its blockade on Iranian ports.

Iran's nuclear enrichment remains a sticking point in talkspublished at 11:23 BST 19 April

11:23 BST 19 April

Frank Gardner
Security correspondent

Iran wants sanctions lifted. Its economy is in dire straits and it is in an even worse condition now that it can’t get its exports out from its ports in the Gulf.

Time is not on Iran’s side.

The US and Iran have been negotiating over two things:

• Nuclear enrichment
• The highly-enriched uranium still sitting in tunnels down below the mountains of Isfahan, where the US bombed last year

There has been lots of fanciful talk about sending in a special US military operation to try and get it out, but forget about that. Iran would surround the place with troops.

You can not do that without its permission. It’s going to be a very delicate operation to get down into the bombed out tunnels.

The United Nations' nuclear watchdog - the International Atomic Energy Agency - is prepared to do that but not under fire. It may be a joint mission with the US but only when Iran agrees.

Image source, Reuters

The body of a French peacekeeper killed in southern Lebanon is to be returned to Paris this evening, the United Nations Interim Force in Lebanon (Unifil) tells the BBC.

French President Emmanuel Macron has blamed Hezbollah after a French soldier serving with Unifil died when their patrol came under small arms fire on Saturday.

In Sunday's update, Unifil says that two of the three other peacekeepers who were "severely injured in the attack" are still receiving treatment in Beirut.

A third peacekeeper is being treated for "moderate injuries" in a southern Lebanon Unifil facility, it adds.

Hezbollah has issued a statement denying it was responsible for the attack, describing the accusations as "rushed".

Image source, MarineTraffic

As we've been reporting, Iran has again closed the Strait of Hormuz in response to the continued US blockade of Iranian ports.

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.

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

The closure of the Strait of Hormuz is dominating the diplomatic messages from both the Iranian and US sides, who both blame each other for the crisis, the BBC's chief international correspondent Lyse Doucet says.

Reporting from inside Iran, she says there is little sign of the peace deal that President Trump keeps hinting at, and even an extension to the current ceasefire, which expires in just a few days, is yet to be decided.

Lyse Doucet is reporting from Tehran on condition that none of her material is used on the BBC's Persian Service. These restrictions apply to all international media organisations operating in Iran.

The Israel Defense Forces (IDF) has just posted on messaging app Telegram saying it "eliminated" more than 150 "Hezbollah terrorists" in 24 hours "prior to the ceasefire understandings taking effect".

The IDF also says it hit about 300 military sites in the strikes, such as command centres and weapons storage facilities, across several areas in Lebanon.

It claims to have killed several Hezbollah commanders and says it will continue to remove any threat to Israeli civilians and soldiers.

The ceasefire in Lebanon is allowing authorities there to continue their work to reopen and repair infrastructure in the south of the country.

The Lebanese military says it has "fully reopened" a road linking the city of Nabatieh with the Khardali area, and had "partially reopened the Burj Rahal-Tyre bridge", in an update this morning.

Yesterday, BBC Arabic's correspondent Carine Torbey sent a report from the border town of Khiam, where the Lebanese army set up a barrier to prevent residents from returning to their homes as loud explosions continued to be heard in areas that were partly under Israeli occupation.

The ceasefire between the US and Iran, and the one between Israel and Lebanon, both appear to be holding, but there have been a number of incidents reported that have resulted in deaths.

In southern Lebanon, the Israel Defense Forces says that two soldiers have died since the ceasefire was implemented. Israeli media report that Sgt Maj (Res) Barak Kalfon died in an explosion while clearing buildings on Friday, which also injured three other soldiers.

Sgt First Class (Res) Lidor Porat was killed in an incident which also resulted in nine others needing hospital treatment, the Israeli military announced today. Local media say that the armoured vehicle the troops were travelling in hit a landmine, and Israel would be investigating to ascertain when the explosive was placed, as a possible breach of ceasefire terms.

Separately, a French peacekeeper serving with the United Nations Interim Force in Lebanon (Unifil) was also killed in Lebanon in an attack blamed on Hezbollah by President Macron. The Iranian-backed armed group denied being behind the incident.

Image source, Reuters

Here's a reminder of the different ceasefire deals currently in place in the war in the Middle East:

US and Iran

• Started: 8 April
• Due to last: 14 days (22 April)

Pakistan, which had mediated talks between Iran and the US, has said Lebanon is included in the ceasefire. Iran agrees, but the US and Israel dispute this.

Israel and Lebanon

• Started: 16 April 17:00 EDT (21:00 GMT; midnight local time)
• Due to last: 10 days (26 April)

The deal was subsequently agreed by the two countries and announced by the US.

Israel and Lebanon's leaders have both welcomed the truce and Trump has urged the the Iran-backed group Hezbollah in Lebanon to abide by it.

Hezbollah has also signalled a willingness to participate in the ceasefire but said it must include "a comprehensive halt to attacks" across Lebanon and "no freedom of movement for Israeli forces".

Israeli Prime Minister Benjamin Netanyahu has meanwhile said troops will remain stationed 10km-deep (6.2 miles) into southern Lebanon, despite the ceasefire.