The US and the UK have sent a "clear message" that they will not tolerate attacks on their ships in the Red Sea. They launched strikes against Houthi rebels in Yemen on Thursday. However, they are already facing a backlash.

On Friday, tens of thousands of Yemenis gathered in the capital Sanaa to protest the attacks on missile batteries, radar installations and drones. They chanted "America is the enemy of God" and pledged solidarity with the Palestinian people.

Houthi leaders said they will continue their attacks to stop Israeli ships and other vessels headed to Israeli ports.

Military spokesperson Yahya Saree said, "The American and British enemy bears full responsibility for its criminal aggression against our Yemeni people, and it will not go unanswered and unpunished."

US President Joe Biden said in a statement that he will not hesitate "to direct further measures" against the Houthis if they continue to target shipping. He added that it is necessary to protect the free flow of international commerce.

Still, some US allies in the region are concerned. Officials in Oman warned that the attacks will only add "fuel" to an extremely dangerous situation and urged all parties to show restraint.