The US launched a fresh strike against a Houthi target in Yemen overnight
The attack targeted a radar site with Tomahawk missiles launched from a warship, the US military says
The military describes the attack as a "follow-on action" from Friday's wider US-UK strikes, which targeted nearly 30 locations
Earlier, President Biden warned the US would respond if the Houthis continued "outrageous behaviour" in attacking Red Sea shipping
But the Iran-backed group says attacks in Yemen will not go without "punishment or retaliation", vowing to continue attacking ships
The Houthis' drone and rocket attacks on vessels have forced major firms to reroute their ships, raising fears fuel prices will rise and supply chains will be damaged
The militants, who control a large part of Yemen, claim their strikes on Red Sea ships are in support of Gaza
Image source, Getty ImagesTaking questions in Pennsylvania, Biden tells reporters the strikes in Yemen were a "success".
"I don't think there are any civilian casualties," he adds.
A military spokesperson for the Houthi rebels has told media at least five people were killed and six wounded in the strikes, without specifying whether they were civilians.
During a small-business tour, Biden said the US was not in a proxy war with Iran.
"Iran does not want a war with us," he said, according to White House pool reporters.
The US president also added that he believed the Houthis were a terrorist group.
The Trump administration designated the Houthis as a foreign terrorist organisation.
But that move was revoked by Biden administration, external after less than a month in office.
Image source, Getty ImagesPresident Joe Biden en route to Allentown, Pennsylvania
US President Joe Biden, who is on an official visit to Allentown, Pennsylvania, has issued a fresh warning to the rebels in Yemen.
A reporter asked him: "Will you continue bombing the Houthis if the attacks don't stop?"
Biden responded: "We will make sure that we respond to the Houthis if they continue this outrageous behaviour."
More now from the Pentagon press briefing, where officials have been discussing the US and UK attacks on Houthi targets in Yemen.
A spokesperson says US officials believe that the Houthis have "degraded capability" after the strikes, and also says he doesn't believe that the group would be able to "execute the same way they did" on Tuesday.
Houthis fired 18 drones, two cruise missiles and an anti-ship missile on Tuesday afternoon, all of which were shot down by UK and US naval vessels, including the USS Dwight D Eisenhower aircraft carrier, in the Red Sea.
Earlier, a senior US military official said the US and the UK had struck "just under 30 different locations in Yemen."
The strikes were in response to repeated attacks by the Iran-backed group on commercial vessels in the Red Sea.
A senior US military official has told reporters that "just under 30 different locations" have been struck by the US and British forces in Yemen.
At a defence briefing on Friday, the Pentagon official said 150 munitions had been employed, with US forces conducting their operations from the Eisenhower strike group.
Director of Operations Lt Gen Douglas A Sims ll said the "majority of the locations that we hit were not in built up locations at all," noting that the number of casualties from the strikes most likely will not be very high.
But the official added that the Houthis launched an anti-ship ballistic missile on Friday in retaliation for the US and UK targeting the Iran-backed movement.
"We did see one anti ship ballistic missile that was fired today that did not hit any ships of any kind... my guess is that the Houthis are trying to figure things out on the ground and trying to determine what capabilities still exist for them."
Lyse Doucet
Chief International Correspondent
Image source, AFPMohammed Ali al-Houthi took part in a protest following US and UK strikes in Sana'a
When it comes to making the Houthis’ case to the world, Mohammed Ali al-Houthi has long been the movement’s most prominent public face - the spin doctor with a swagger and a swift quip.
Asked by a BBC Arabic presenter about their connection to events happening in Gaza which was “miles and miles away,” he shot back, querying whether Biden and Netanyahu “lived in the same flat” and if the French president “also lived on the same floor”.
He once showed up on a bicycle when meeting a European diplomat in the capital Sana’a.
When we went to interview him, he met us in the empty international airport which was shutdown by the Saudi-led coalition when it unleashed war on the Houthis in 2015.
He’s an influential figure, focused on the Houthis' internal governance, overseeing local supervisors who are the “eyes and ears” of the movement.
But the movement’s greatest power lies with the top leader who never speaks to the media and rarely appears in public.
The reclusive Abdul Malik al-Houthi is the driving force behind their growing military might. In recent years, foreign envoys granted a rare audience only saw him on a screen.
Image source, Getty ImagesDemonstrators lift posters of Abdul-Malik al-Houthi during a protest in support of Gaza in December
Chris Mason
Political editor
In the UK, senior government figures are emphasising tonight what they see as the limited nature of these airstrikes.
They’re not expected to continue in the coming nights, although how America, the UK and their allies react if the Houthi attacks continue is a big question.
Back home – there's an argument around the principles of how or whether ministers should seek the permission of Parliament in advance of military action. The government has the prerogative to act without it.
But in the last few decades prime ministers have sometimes consulted the Commons - and sometimes not.
Theresa May chose not to before airstrikes on Syria in 2018. David Cameron did seek parliamentary approval for similar action in 2013 – and lost.
The Labour leader Keir Starmer backs last night’s action. The Liberal Democrats and the Scottish National Party both condemned the Houthis but said MPs should have had a say in advance. Plaid Cymru said it was “shocked” the airstrikes had taken place without parliamentary scrutiny.
Rishi Sunak pointed to the recent precedents of acting first, and said he’d address the Commons about it on Monday.
BBC Monitoring
In Yemen, the joint US-UK strikes have dominated media reporting today. The Houthi-affiliated Al-Masirah TV channel broadcast rolling coverage of reaction and commentary - including of huge demonstrations held in the capital Sanaa and other cities, with protesters chanting pro-Palestinian and anti-US slogans.
Houthi officials were swift to condemn the strikes, which they described as an act of “idiocy” and “aggression”, aiming to “protect Israel” and “stop Yemen from supporting Palestinians”.
The group’s officials have reiterated their vow to respond to the strikes, and to deny passage to ships “linked with Israel” until humanitarian aid is allowed into Gaza.
Several prominent anti-Houthi voices also criticised the strikes. One wrote, external: "It is impossible to stand with America and Britain, we are against any strikes on Yemen whatever the justification.”
Image source, Al-Masirah TVThe Houthis have vowed an "even bigger" response to the strikes
We've been examining videos of US and UK strikes on Houthi targets from inside Yemen - here's what we've learnt:
As we reported earlier, another missile has been fired towards a vessel just south of Yemen - and we've got a few more details now.
British maritime security firm Ambrey says the Houthis mistakenly targeted a tanker carrying Russian oil. It says the Houthis thought the vessel was linked to the UK, based on out-of-date publicly available information.
"This was the second tanker mistakenly targeted by the Houthis whilst carrying Russian oil," Ambrey said. The missile hit the water 400-500 metres away from the ship, and was followed by three small craft, according to the UKMTO. There were no injuries or damage.
US national security spokesman John Kirby was asked about today's missile attack just now. He said he doesn't have the reports on this attack but "nobody was Pollyanna-ish about the possibility that the Houthis might conduct some sort of retaliation".
We're still hearing from National Security Council spokesman John Kirby.
Asked whether there have been any economic impacts as a result of the strikes, Kirby says no.
He's also asked if the US views the Houthis as a terrorist organisation.
"No decisions have been made yet," he says, noting that the Houthis were previously de-listed from the Foreign Terrorist Organizations list.
He adds that he won't get into hypotheticals about future military actions in the region, but the US won't "hesitate to take further action" if necessary.
"The Houthis are the ones that escalated here," he says. "They have a choice to make."
White House national security spokesman John Kirby has been speaking on board Air Force One where he's been taking questions from reporters.
Asked how much the Houthi capabilities have been hit in the strikes, he says they're still doing "battle damage assessment" and that could take some hours yet.
But he says they were all "valid, legitimate military targets" that were hit - and sites used to store, launch and guide missiles and drones.
Asked if the president is ready for a war in Yemen, and whether he would send in ground troops, Kirby replies: "We're not interested in a war with Yemen. We're not interested in a conflict of any kind here."
Everything the president has been doing is to prevent any escalation of conflict, he says.
As we've been reporting, huge crowds have gathered in Yemen's capital, Sanaa today. There have been regular mass rallies in Yemen in support of Palestinians and Gaza since October - but as our security correspondent pointed out earlier, this one is exceptionally large.
Today's pictures also show groups of people attacking US and Israeli flags.
Here are some photos we've been receiving into the newsroom:
Image source, AFPDemonstrators have taken to the streets with Palestinian flags in support of Palestinians and Gaza
Image source, ReutersCrowds gather around Israeli and American flags, which have been set on fire
Image source, EPAPeople were seen holding weapons and chanting on the streets of Sanaa
Image source, EPAMass demonstrations like this are not uncommon in Yemen
In just a few minutes we're going to hear from White House national security spokesman John Kirby who'll be speaking to reporters from aboard Air Force One.
Stick with us for updates on what he says - we'll bring them to you when we have them.
Frank Gardner
BBC News, Security Correspondent
There is a whole spectrum of possible scenarios which could now develop in the Red Sea, ranging from the optimistic to the catastrophic.
Best case: tempers cool, the Houthis have second thoughts and refrain from attacking any more shipping. This is unlikely. Today’s mass demo shows they have massive popular support at home and they have already issued defiant warnings of retaliation.
Worst case: the Houthis continue targeting shipping and also make good on their promise to attack US/UK assets and manage to score a direct missile hit on a warship.
This is a militia that has spent years resisting devastating airstrikes by the Saudi Air Force and is now, thanks in part to help from Iran, more firmly in control of most of Yemen than ever. The Houthis think they are invincible. They certainly have patience and an abundance of weaponry, much of it hidden in mountain tunnels.
There is now a dangerous inflection point for the US-led coalition in the Red Sea whereby it risks getting sucked into a costly and unwinnable war, just as the Saudis did.
A new missile has been fired towards a vessel just south of Yemen, says the United Kingdom Maritime Trade Operations (UKMTO) which is the part of the Royal Navy that shares maritime security information.
UKMTO says the master of the vessel reported the missile landing in water about 400m (1,312 ft) away in the Gulf of Aden, and then being followed by three small craft.
No injuries or damage were reported and the vessel is proceeding to the next port. The incident happened at 15:00 GMT, they said.
There have been repeated attacks on vessels in the Red Sea and near to Yemen by Houthi rebels since the Israel-Hamas war.
Image source, Getty ImagesCanada - along with Australia, Bahrain, Denmark, Germany, the Netherlands, New Zealand and South Korea - backed the strikes
We've just heard from Canadian Prime Minister Justin Trudeau, who has answered some questions from reporters on the country's involvement with the strikes in Yemen.
He starts off by calling strikes by Houthi militia on civilian and commercial vessels "absolutely unacceptable".
"They're contrary to international law, they're contrary to the UN charter," he says.
"This is why members of the international community including Canada... have made a commitment to protect this region and this trade. Canada is supporting what has been done by the United States," he says in French, according to a translator.
He adds that Canada did not offer "operational resources" for the strikes that he says were "very narrowly targeted", with the goal of preventing the Houthis from attacking sea lanes.
In the latest episode of Newscast, we explain why the UK and US have launched airstrikes on Iranian-backed Houthis in Yemen.
We hear from Sophia Gaston, head of foreign policy at the Policy Exchange think tank and Sir Mark Lyall Grant, former permanent representative of the UK to the UN. They're also joined by the former Nato commander, Rear Adm Dr Christopher Parry.
Listen here - or you can also read about the Houthis here.
Gary O'Donoghue
Senior Correspondent, North America
It's clear from senior administration officials that an attack on an American commercial vessel, being escorted by US military vessels on Tuesday, was the tipping point for last night's action.
Twenty drones and three missiles were shot down and, had that not happened, officials say the ships could have been sunk, including one that was carrying jet fuel.
The fact that this action was clearly telegraphed in both Washington and London is a clear indication that the US and UK governments, along with the other members of what officials here call "a coalition of the willing", wanted to minimise any collateral damage and loss of life; degrading facilities and capabilities was, they say, their aim.
The Pentagon is expected to give further details of the battle damage assessment in the coming hours and days, but one senior administration official said indications were that they had had "good effects".
The concern in Washington has always been the escalation of the Gaza conflict to the wider region, and officials continue to stress that this is their key aim; but they are also acutely aware of the potential commercial damage to the world economy should shipping continue to come under fire in the route through the red sea and the Suez canal.
Image source, reuterJohn Kirby will provide an update on US operations in Yemen
White House national security spokesman John Kirby is expected to speak to the media aboard Air Force One in a little under two hours.
But we've been given an insight into what he'll say as he appears on morning news programmes in the US.
He's told MSNBC the airstrikes in Yemen were targeted at the Houthi's ability to store, launch and guide missiles and drones. The impact of the air strikes are still being assessed, he adds.
He also says the US wants to avoid conflict with Iran. "We're not looking to escalate and there's no reason for it to escalate beyond what happened over the last few days," he says.