As witnesses in Yemen confirmed explosions throughout the country to Reuters, President Joe Biden cautioned in a statement late on Thursday he would not hesitate to carry out further action if needed.
"These targeted strikes are a clear message that the United States and our partners will not tolerate attacks on our personnel or allow hostile actors to imperil freedom of navigation," Biden said on Thursday.
Britain's ministry of defence said in a statement that "early indications are that the Houthis' ability to threaten merchant shipping has taken a blow".
A Houthi official confirmed "raids" in the capital Sanaa along with the cities of Saada and Dhamar as well as in Hodeidah governorate, calling them "American-Zionist-British aggression".
The ongoing strikes are one of the most dramatic demonstrations to date of the widening of Israel-Hamas war in the Middle East since its eruption in October.
One US official, speaking on condition of anonymity, said the strikes were being carried out by aircraft, ship and submarine. The official said more than a dozen locations were targeted and the strikes were intended to weaken the Houthi's military capabilities and were not just symbolic.
Rishi Sunak and Joe Biden have authorised joint attacks on Houthis in Yemen. (AP PHOTO)
The Houthis, who control most of Yemen, defied a United Nations and other international calls to halt their missile and drone attacks on Red Sea shipping routes and warnings from the US of consequences if they failed to do so.
The Houthis say their attacks are in support of Hamas, the Palestinian Islamist group that controls Gaza. Israel has launched a military assault that has killed more than 23,000 Palestinians in Gaza after Hamas' attack on Israel on Ocober 7, which killed 1200 people.
The Houthi have attacked 27 ships to date, disrupting international commerce on the key route between Europe and Asia that accounts for about 15 per cent of the world's shipping traffic.
Witnesses told Reuters that the raids on Thursday targeted a military base adjacent to Sanaa airport, a military site near Taiz airport, a Houthi naval base in Hodeidah and military sites in Hajjah governorate.
Earlier on Thursday, the Houthis' leader said any US attack on the group would not go without a response.
The Houthis, who seized much of Yemen in a civil war, have vowed to attack ships linked to Israel or bound for Israeli ports. However, many of the targeted ships have had no links to Israel.
The US military on Thursday said the Houthis fired an anti-ship ballistic missile into international shipping lanes in the Gulf of Aden, the 27th attack by the group since November 19.
The overnight strikes in Yemen came just days after the Houthis largest attack to date on January 9 in the Red Sea, which forced the US and British naval forces to shoot down 21 Houthi drones and missiles fired towards the southern Red Sea. The US military described it as a complex attack.
Biden, in his statement, said the Houthis directly targeted American ships.
Houthi troopers patrol during a gathering at the end of military training in Sana'a, Yemen (EPA PHOTO)
In December, more than 20 countries agreed to participate in a US-led coalition, known as Operation Prosperity Guardian, safeguarding commercial traffic in the Red Sea. However, the US and British strikes are taking place outside that defensive coalition.
Biden said Australia, Bahrain, Canada and the Netherlands supported the operation.
"The response of the international community to these reckless attacks has been united and resolute," Biden said in a statement.Â
