The Houthi movement has threatened a "strong and effective response" after the United States carried out another strike in Yemen overnight, further ratcheting up tensions as the US vows to protect shipping from attacks by the Iran-aligned group.
The strikes have added to concerns about the escalation of the conflict that has spread through the region since the Palestinian militant group Hamas and Israel went to war, with Iran's allies also entering the fray from Lebanon, Syria and Iraq.
The latest strike, which US officials said hit a radar site, came a day after dozens of US and UK strikes on Houthi facilities in Yemen.
"This new strike will have a firm, strong and effective response," Houthi spokesman Nasruldeen Amer told al-Jazeera, adding there had been no injuries nor "material damages".
Mohammed Abdulsalam, another Houthi spokesman, told Reuters the strikes, including the one overnight that hit a military base in Sanaa, had no significant effect on the group's ability to prevent Israel-affiliated vessels from passing through the Red Sea and the Arabian Sea.
The Pentagon said on Friday the US-UK strikes had "good effects".
Hans Grundberg, United Nations special envoy for Yemen, on Saturday urged maximum restraint by "all involved" in Yemen and warned of an increasingly precarious situation in the region.
The Houthis say their maritime campaign aims to support Palestinians under Israeli siege and attack in Gaza, which is ruled by Hamas.
Many of the vessels they have attacked had no known connection to Israel.
The group, which controls Sanaa and much of the west and north of Yemen, has also fired drones and missiles up the Red Sea at Israel itself.
The guided missile destroyer Carney used Tomahawk missiles in the follow-on strike early on Saturday local time "to degrade the Houthis' ability to attack maritime vessels, including commercial vessels," the US Central Command said in a statement on X.
In Sanaa, government employee Mohammed Samei said the attacks were an act of "brutal aggression" and marked a new stage of a war Yemen had endured for 10 years.
Hussein Kabsi, a retired government employee, said supporting the Palestinians was a "religious and moral duty".
"Our stance is unwavering, we will (continue) to stand with our brothers in Palestine and Gaza until victory and until all Palestinian land is liberated - not just Gaza," he said.
On Friday, hundreds of thousands of people rallied in Sanaa, chanting slogans denouncing Israel and the United States, footage broadcast by the Houthis' al-Masirah TV showed.
Even as Houthi leaders swore retaliation, US President Joe Biden warned on Friday that he could order more strikes if they do not stop their attacks on merchant and military vessels in one of the world's most economically vital waterways.
"We will make sure that we respond to the Houthis if they continue this outrageous behaviour," Biden told reporters.
White House spokesman John Kirby said the initial strikes had hit the Houthis' ability to store, launch and guide missiles or drones, which the group has used to threaten shipping.
He said the US had no interest in a war with Yemen.
The Houthis said five fighters were killed in the initial strikes.
Biden, whose administration removed the Houthis from a State Department list of "foreign terrorist organisations" in 2021, was asked by reporters if he felt the term "terrorist" described the movement now.
"I think they are," he said.
At the UN Security Council on Friday, Russia's UN. ambassador Vassily Nebenzia said the US and the United Kingdom "single-handedly triggered a spillover of the conflict (in Gaza) to the entire region".
A senior US official accused Iran of providing the Yemeni group with military capabilities and intelligence to carry out their attacks.
Iran condemned the US and UK strikes but there has been no sign so far that Iran is seeking direct conflict.
Houthi attacks have forced commercial ships to take a longer, costlier route around Africa, creating concern about a new bout of inflation and supply chain disruption.
Container shipping rates for key global routes have soared this week.
