The US warns of an "imminent" Iranian attack in the Saudi city of Dhahran, a major centre for the oil industry and where a US consulate is located
Meanwhile, US President Donald Trump tells Iran it's "too late" to talk, adding their "air defense, air force, navy, and leadership is gone" - watch live above as he speaks alongside Germany's chancellor at the White House
Israel says it carried out new attacks on Iran's "leadership compound" on Tuesday, including the presidential office - with more attacks on Tehran announced later
The number of people killed in Iran since US-Israeli attacks began on Saturday has reached 787, the Red Crescent says
On international markets, oil and gas prices are up, while share prices are down - here's a round-up
The UK will send helicopters with counter-drone capabilities and air defence destroyer HMS Dragon to Cyprus, after attacks on a British base there, PM Keir Starmer says
The US and Israel struck Iran on Saturday, killing Supreme Leader Ayatollah Ali Khamenei. Iran has retaliated with a wave of attacks across the region
Donald Trump begins the briefing by describing his relationship with Germany, which he says shares a "great affinity" with the US.
He's then quickly on to Iran, which he says now has no navy, no air force or air detection.
"Just about everything's been knocked out," Trump says.
He adds that the pair will also be talking about trade deals.
US President Donald Trump and German Chancellor Friedrich Merz are now in front of reporters in the White House and are beginning their media briefing.
Watch live at the top of the page and we'll also bring you the key comments here.
The United States embassy in Lebanon's capital, Beirut, says it "will be closed until further notice".
"All other regular and emergency consular appointments have been cancelled," it says, adding that it will give an update when the embassy reopens.
Beirut, and parts of southern Lebanon, have been hit by Israeli strikes in recent days. Israel says this is in response to attacks from the Lebanon-based, Iran-backed militant group, Hezbollah.
The announcement follows the US closing its embassy in Kuwait until further notice and its diplomatic mission in Riyadh, Saudi Arabia, after it was hit by a drone. The US also evacuated the Jordanian embassy yesterday after explosions were heard nearby.
The US embassy in Muscat, Oman, had put out a "shelter in place" order, but it has since partially lifted.
Malu Cursino
Live reporter
Image source, EPASmoke rises over central Tehran after an air strike hits Iran's capital
President Trump - says he has told Iran it is "too late" to talk, as US-Israeli strikes continue to target the country. He has also warned of an "imminent" Iranian attack in the Saudi city of Dhahran, which is a major centre for the oil industry.
We're expecting to hear from Trump, who's been meeting German Chancellor Merz at the White House today, shortly.
Inside Iran - 787 people have been killed in the country since the US and Israel launched their wave of strikes against Tehran on Saturday, according to Iran's Red Crescent.
Iran's ambassador to the United Nations in Geneva, Ali Bahreini, has told reporters that Tehran is "doubtful about the usefulness of negotiation" with the United States.
Mehrabad International Airport in Tehran, which mainly handles domestic flights, has also been hit by strikes.
Israel's military - a short while ago Israel's Defense Forces said they had concluded a large-scale wave of strikes targeting infrastructure in the Iranian cities of Tehran and Isfahan.
The country's Defence Minister Israel Katz has also announced that its ground troops will move in to Lebanon to "seize additional strategic areas" in order to "defend the border communities".
Elsewhere in the region - Iranian authorities have continued their retaliatory strikes, which have hit as many as nine countries in the Gulf. The United Arab Emirates says it has intercepted 172 Iranian missiles and 755 drones since Saturday. Qatar says they have no ongoing relations with Tehran, while Saudi Arabia condemns Iran's attack on the US embassy in Riyadh.
UK involvement - Prime Minister Starmer announced a short while ago that the United Kingdom is increasing its air defences at its base in Cyprus - RAF Akrotiri.
The UK is planning to deploy helicopters with counter-drone capabilities and also to send air defence destroyer HMS Dragon to the eastern Mediterranean.
It comes a day after the runway of RAF Akrotiri was hit by a drone, causing what the Ministry of Defence (MoD) described as "minimal damage".
The UK is increasing its air defences at its base in Cyprus by deploying helicopters with anti drone capabilities, the prime minister says.
Keir Starmer says the air defence destroyer HMS Dragon will also be sent to the region.
He adds that the UK "is fully committed to the security of Cyprus and British military personnel based there".
The announcement comes after Iranian drone attacks on the British base on the island, RAF Akrotiri, in recent days - one hit overnight on Sunday causing "minimal damage", while another two were intercepted on Monday, according to a Cypriot government spokesperson.
We're expecting to soon hear from US President Donald Trump and German Chancellor Friedrich Merz, who is in Washington DC on a White House visit.
Tap the watch live button at the top of this page to see what they say, and we'll bring you the latest lines as we get them.
Sam Harrison and Nick Triggle
Reporting from Heathrow Airport
Natalie Fleming says she's been trying to get home since Saturday
Natalie Fleming was on holiday in Dubai when an emergency alert went off on her phone on Saturday.
“It just said get to a safe space. But it doesn’t tell you where is a safe space. What do you do? We went into the walk-in wardrobe in our apartment with all our luggage.”
Since then she has been trying desperately to get home and finally got on an Emirates flight to Heathrow on Tuesday.
Jamie Browne says he's "grateful to be back"
Also on the flight was Jamie Browne, who had recently moved out to the United Arab Emirates with his young family.
He saw missiles being launched to intercept Iranian bombs. “We knew we had to get out then. It’s been a traumatic time. I’m really grateful to be back.”
Meanwhile, Linda got stranded during a stopover on her return from a business trip to India.
“It was terrifying. We could hear explosions. It was noisier in the mornings - then it would go quiet. It’s bizarre. You are in a tourist destination and then you are hearing explosions.
“I feel very lucky right now. Lots of people are still stuck there.”
By Tom Gould and Jake Horton
BBC Verify has geolocated images showing a strike on the port of Duqm on the east coast of Oman.
Video circulating on social media shows what appears to be a drone flying into a fuel storage facility followed by an explosion. In another picture you can see a plume of smoke rising from the site.
We matched the crane, distinctive tower building and fuel tanks seen in the footage with satellite imagery of the area.
Fuel storage tanks at the port were targeted by multiple drones, according to the maritime risk company Vanguard Tech.
Omani authorities said the damage was contained and no casualties were reported. Local media reported that one worker was injured.
BBC Verify previously confirmed a strike on the same site on Sunday.
The BBC News channel is now putting some of the most searched questions on the US-Israel war with Iran to our panel of experts and correspondents.
You can watch live at the top of the page.
The Israel Defense Forces says its large-scale wave of strikes on Iranian infrastructure in Tehran, which we reported about just over an hour ago, has now concluded.
In an update on the messaging app Telegram, it says it attacked infrastructure and "sites used by the [Iranian] regime to produce weapons", saying there was an "emphasis on ballistic missile production sites".
While these attacks were in progress, the IDF says it carried out simultaneous attacks in Iran's city of Isfahan, which is approximately 435km (270 miles) away.
These attacks, the IDF says, targeted ballistic missile systems, including launchers and missile storage sites intended for use against Israel.
Our panel of experts and correspondents are preparing to answer some of the most searched questions on the US-Israeli war with Iran.
The panel will feature BBC chief international correspondent Lyse Doucet, business editor Simon Jack, experts from BBC Persian and chief presenter Sumi Somaskanda, who will be reporting from the White House.
They will be addressing what's happening on the ground in Iran and the implications for travel, oil prices and economies around the world.
You can watch live from 15:30 GMT at the top of this page.
James Waterhouse
Reporting from the Turkey-Iran border
Image source, ReutersPeople pictured making their way through the Turkey-Iran Kapikoy border crossing on Tuesday
Tucked within the snowy mountains at the Kapikoy border crossing, suitcases are being wheeled in both directions.
Those emerging from Iran often talk about the heavy bombardments they’re trying to escape. One woman, in her twenties, claimed she’d never seen the regime so fragile, and was hopeful more international support would follow.
“If this military action helps topple the government, maybe it’s a good idea,” says Ede, who protested against the authorities at the start of the year. He saw dozens of people killed by masked security forces.
“If this is just about bombardment, maybe not; I’m no politician though,” he adds.
We meet Emir Mohamed heading the other way. He’s moving back to Iran out of concern for his family, and sees Donald Trump’s military intervention as hypocritical, arguing that the US should stay out of Iranian affairs.
We encounter those who are anti-regime, but also against the way the US and Israel have tried to topple it.
Emily Holt
Reporting from Manchester Airport arrivals
I'm at Manchester Airport, where a flight from Dubai landed a short while ago.
Neil Ramchander, who has been stuck in Dubai for the last three days, says the experience was "pretty terrifying" and there was a “huge sense of relief” on the flight home. "We all clapped on arrival," he tells me.
On the way home to Ireland, Rebekah O’Dwyer says it was "a little bit nerve-wracking" getting on the flight. In Dubai, she says: "You could hear all like the sirens and all like the loud kind of noises above us. We didn’t know where to go, where to look."
Kylie Bergman recalls receiving a phone call at 01:30 this morning, where she was told to get on a plane. By 04:00 she was on the move. Getting the call "felt like [she] had won the lottery," she says.
"I'm here and I'm so elated," Kylie Bergman says
Image source, ReutersEarlier we reported about video and satellite images showing fire and damage at the Fujairah Oil Terminal in the United Arab Emirates.
We've just seen some more images showing smoke billowing above the oil terminal, which is on the Gulf of Oman coast.
The UAE's Fujairah media office says a fire broke out after debris fell from a drone that had been intercepted by air defences, but it adds the fire has been put out and no injuries reported.
Image source, Reuters
Image source, Reuters
Bernd Debusmann Jr
Reporting from the White House
Image source, ReutersChancellor Merz (L) and President Trump (R) pictured together at a world leaders' summit in Egypt in October last year
German Chancellor Friedrich Merz is expected to arrive at the White House in a few hours' time to meet Donald Trump - the US president's first meeting with a foreign leader since strikes began in Iran.
The visit has been long-planned and was announced before the US-Israeli military operation began, but both leaders are now focused on their interests in the Middle East as fighting escalates.
While Germany has neither endorsed or supported the operation, the country has - along with France and the UK - called on Iran's leaders to stop their retaliatory strikes.
In a joint statement on Sunday, those three countries said they would "take steps to defend our interests and those of allies in the region", including, potentially, by "enabling necessary and proportionate defensive action" to destroy Iran's capability to fire drones and missiles.
Trump will likely be hoping that Germany takes those steps and the two leaders will almost certainly discuss Iran's future.
Josh Martin
Business reporter
Conflict in the Middle East has caused oil and gas prices to jump, but it may also lead to poorer crop yields and higher food prices if it continues to impact global shipping.
The continued closure of the Strait of Hormuz would lead to higher global prices of staples like corn, wheat and rice because the waterway is vital to shipping one-third of the world's urea - an essential ingredient in fertiliser, the chief executive of Yara has told World Business Express.
"In some crops, you could see reductions [of yields] of up to 50%," said Svein Tore Holsether, who runs the world's second-largest fertiliser company.
The timing of the closure means supply of urea is constrained at a time when farmers and growers are buying fertiliser to apply it to fields, he said.
Iran's ambassador to the United Nations in Geneva, Ali Bahreini, has cast doubt on the prospect of negotiations with the United States.
"For the time being we are very doubtful about the usefulness of negotiation," Ali Bahreini told reporters in Geneva on Tuesday, according to the Reuters news agency.
It comes after US President Trump declared it was "too late" to talk in a post on his Truth Social messaging platform.
Image source, EPAAli Bahreini pictured in Geneva following the US-Iraeli strikes on Iran
Ghoncheh Habibiazad
Senior reporter, BBC Persian
Image source, ReutersA street in Tehran this morning following a blast at a police station
I've been speaking to people inside Iran following a new wave of strikes.
Omid, in his twenties, says people are becoming uneasy about how long the situation will go on for.
"I had assumed they would target certain officials like [Iran's former Supreme Leader] Khamenei and that it would be over by now," he says.
"There is a greater security presence on the streets, but the streets themselves are empty. Some shops have closed, particularly those near the affected areas... I heard the sound of explosions today in Tehran just now”.
Pouya, in his thirties, tells me that prices have gone up since the attacks started. The cost of rice and potatoes have increased drastically, he says from Pardis - a city near Tehran.
From the city of Karaj, Shayan says it's very difficult to get online now. "The price of everything has gone up," he says. "I didn’t hear any strikes today; it feels like the calm before the storm," he adds.
Maryam, in her twenties and in northern Tehran, sent me a text to say: "The attacks last night were terrible. Our house was shaking.
"We were preparing to leave the area because our home is near where the IDF [Israel Defense Forces] had issued an evacuation order. Before we could set off, they struck.”
In an update on the messaging app Telegram, the Israel Defense Forces says it has begun a large-scale wave of strikes targeting infrastructure in Iran's capital, Tehran.
It says there will be more details to follow.
By Jake Horton
A new satellite image taken today of the southern Iranian port of Jask shows one of its jetties has apparently been damaged following reports of an air strike.
Image source, Planet Labs PBCThe smoke plume in the satellite image is consistent with a verified picture showing part of the port on fire after it was reportedly attacked yesterday.
The picture shows a massive cloud of thick, black smoke above a large area of the port which is on the Gulf of Oman.
A reverse image search shows the picture was first posted online yesterday
Image source, XNasa's Fire Information for Resource Management System (FIRMS), which detects hotspots on the Earth’s surface, picked up a heat source in the area at around 21:00 GMT on Monday.
