BRITAIN last night joined the US to strike Yemen's Houthis in a third wave of attacks on the Iran-backed rebels.
The Pentagon said 36 targets were struck in Yemen on Saturday night - hours after Iraq warned that the Middle East was "on the brink of the abyss" as tensions boil over.
The Houthi targets were in 13 different locations, American officials said.
Royal Air Force Typhoon FGR4s were deployed, supported by Voyager tankers and US forces, the Ministry of Defence confirmed.
Foreign Secretary David Cameron vowed to hold Iran accountable for attacks by Tehran's proxies - and said Britain will use every tool at its disposal to "put out fires".
He told : "There are a lot of fires alight in the world and our job using diplomacy and all the tools that we have is to try and put those fires out and to try and protect Britain from those fires."
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The Ministry of Defence said the Typhoons used Paveway IV precision-guided bombs against multiple military targets "identified by careful intelligence analysis at three locations".
Officials said strikes were "very carefully planned to ensure minimal risk of civilian casualties".
A ground control station - used to guide drones from further inland operating over the sea - in As Salif, by the Red Sea coast, was targeted by jets.
The MoD said a "significant number" of targets were also hit in Bani.
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Targets were also blasted by US F/A-18 fighter jets from the USS Dwight D. Eisenhower aircraft carrier and by American warships firing Tomahawk missiles from the Red Sea.
According to officials, the USS Gravely and the USS Carney, both Navy destroyers, launched missiles.
The UK's Defence Secretary Grant Shapps insisted Britain and the US acted in "self-defence" and that the latest round of strikes is "not an escalation".
He said the third wave of strikes were "proportionate and targeted".
"We have already successfully targeted launchers and storage sites involved in Houthi attacks, and I am confident that our latest strikes have further degraded the Houthis' capabilities," Shapps said.
He blasted the repeated attacks on commercial and military vessels in the Red Sea as "illegal and unacceptable".
The defence secretary added: "We acted alongside our US allies, with the support of many international partners, in self-defence and in accordance with international law."
Earlier unconfirmed reports claimed troops targeted the districts of Al-Lahiya and Al-Durayhimi on Saturday evening.
Saturday's strikes marked the third time the US and Britain have conducted a large, joint operation to strike Houthi weapon launchers, radar sites, drones and buried weapons facilities.
A statement from US Central Command said the joint operation was launched "at the direction of their respective governments, the militaries of the United States and United Kingdom, with support from Australia, Bahrain, Canada, Denmark, the Netherlands, and New Zealand".
"These precision strikes are intended to disrupt and degrade the capabilities that the Houthis use to threaten global trade, and the lives of innocent mariners, and are in response to a series of illegal, dangerous, and destabilising Houthi actions," it added.
In a new warning to the Houthis, US Secretary of Defense Lloyd Austin III vowed "further consequences" to the Iran-backed rebels.
He said: "This collective action sends a clear message to the Houthis that they will continue to bear further consequences if they do not end their illegal attacks on international shipping and naval vessels.
"We will not hesitate to defend lives and the free flow of commerce in one of the world's most critical waterways."
Earlier on Saturday, the US hit and destroyed six Houthi anti-ship cruise missiles in Yemen.
The targets posed an "imminent threat" to American ships in the Red Sea, according to the US Central Command (CENTCOM).
The US forces conducted the "self defence" strikes at around 7.20pm Sanaa time.
CENTCOM said: "This action will protect freedom of navigation and make international waters safer and more secure for US Navy and merchant vessels."
America had previously hit targets in Syria and Iraq on Friday.
It marked Biden's first revenge move after three US soldiers were killed by a drone.
Officials said American missile strikes had hit more than 85 targets, including “command and control headquarters” and ammo dumps.
US Central Command said it targeted Iran’s Islamic Revolutionary Guard’s Quds Force and linked militia groups.
Syrian media said cities in the east of the country were hit.
Iraq said 16 people, including civilians, were killed and 25 wounded.
Iraqi media was reporting strikes in Anbar Province, western Iraq, a large area bordering Syria and Jordan.
Iran itself was not attacked.
US President Joe Biden said on Friday: “Let all those who might seek to do us harm know this: If you harm an American, we will respond.”
US Central Command said the strikes used more than 125 munitions, delivered by numerous aircraft, including long-range bombers.
US soldiers killed
It came hours after the President joined grieving families to see the remains of the three Army reservists returned home.
They were killed in the attack on the Tower 22 base, in Jordan, last Sunday.
They were Sgt William Rivers, 46, Specialist Kennedy Sanders, 24, and Specialist Breonna Moffett, 23.
More than 40 servicemen and women were also injured. The outpost was hit by an Iranian-made drone piloted from Iraq, just six miles away.
The Islamic Resistance, an umbrella group of Iran-backed militias in the region, claimed responsibility.
It said it came in response to the US’ support for Israel.
Official sources earlier this week, revealed plans for the retaliatory strikes and said they would involve a blitz on Iranian people and facilities.
On Friday ahead of the anticipated blitz, the US warned Iraq.
The White House said: "We did inform the Iraqi government prior to the strikes."
But Iraqi military condemned the strikes on militant sites inside the country as a violation of the country's freedoms and rights.
The scheme was leaked as US Defence Secretary Lloyd Austin decried the barrage of drone and rocket attacks recently carried out by Iran-backed militias on US forces in the Middle East.
He said on Thursday: "The president will not tolerate attacks on American troops and neither will I. Our teammates were killed by radical militants backed by Iran, operating in Syria and Iraq."
Mr Austin added that Iran-backed rebels had "tried to create even more turmoil" ever since terror group Hamas unleashed its terror on Israel on October 7, killing 1,200 people and taking 240 hostage.
He declared: "This is a dangerous moment in the Middle East.
"We will take all necessary actions to defend the United States, our interests, and our people.
"We will respond when we choose, where we choose, and how we choose. That's what everyone here is focused on."
Iran is a vital backer of Hamas and many other terrorist groups across the Middle East, including the Houthi rebels in Yemen, who are behind recent attacks against ships in the Red Sea and the Gulf of Aden, and Hezbollah in Lebanon.
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Last month, US forces destroyed anti-ship missiles from the rebels for the same reasons last month.
Also in January, the US and UK carried out airstrikes on rebel bases.
Who are the Houthis?
THE Houthi rebels are terrorising vessels and warships in the Red Sea - but who are they?
The Shia militant group, which now controls most of Yemen, spent over a decade being largely ignored by the world.
However, since the outbreak of the Israel-Gaza war they sprung from relative obscurity to hostage - turning one of the world's busiest
Their warped slogan is “Death to America, Death to Israel, curse the Jews and victory to Islam”.
Why are they attacking ships?
The rebel group has been launching relentless drone and missile attacks on any ships - including warships - they deem to be connected with Israel in solidarity with their ally Hamas.
The sea assaults have threatened to ignite a full-blown war in the Middle East as ripples from Israel's war in Gaza are felt across the region - with Iran suspected of stoking the chaos.
However, there have been frequent attacks on commercial vessels with little or no link to Israel - forcing global sea traffic to halt operations in the region and sending shipping prices soaring.
Houthi attacks in the Red Sea increased 50 per cent between November and December.
The rebel group's leaders have previously pledged the attacks will continue until Israel stops its devastating offensive inside Gaza - despite recent US and UK strikes on their military strongholds.