The US bombed the Houthis in Yemen for the fourth time, according to Pentagon officials on Wednesday night. A few missiles were launched by the Houthi group, and the US stopped them. The US thinks the missiles were meant to attack ships in the Red Sea. The US Middle East command, called Centcom, said that the sites were hit by Tomahawk missiles fired from US Navy ships. The strikes happened after the US labeled the Houthis as "global terrorists". Jake Sullivan, who is in charge of keeping the US safe, said that the decision to cancel the removal of the militants' designation was because they keep attacking ships in the area. The Houthis started attacking ships that were carrying goods in November because they said it was in response to Israel's military actions in Gaza. Since then, the group has attacked many commercial ships in the Red Sea, which is a very busy shipping route. In reply, the US and UK attacked many Houthi targets with air strikes on January 11th. The attacks started because Houthi forces did not stop their attacks even after they were told to. Australia, Bahrain, the Netherlands and Canada supported the strikes. Wednesday's attacks on Houthi targets came after more attacks on commercial ships. A few hours before, the group attacked a boat owned and run by the US for the second time in the past week. The rebels used a one-way drone to attack the M/V Genco Picardy in the Gulf of Aden, according to Centcom. The ship was hurt, but no one on the crew got hurt during the attack. On Monday, the Houthis launched a missile at a US ship. It was the first time they successfully attacked an American ship since their campaign started. US officials said that the strikes on Wednesday were done to stop an attack before it happened. They destroyed weapons that the militants were going to use very soon. "The missiles on launch rails posed a serious danger to merchant ships and US Navy boats in the area. They could have been fired at any moment, so US forces had to defend themselves," said Centcom in a statement. These attacks, plus other things we have done, will weaken the Houthi's ability to keep carrying out dangerous attacks on ships in the Red Sea, Bab-el-Mandeb Strait, and Gulf of Aden, the statement said. The UK's military department said to the BBC that it didn't take part in the recent attacks. Gen Micheal Kurilla, who is in charge of Centcom, said that the US will keep fighting the Houthis because they are putting international sailors in danger and causing problems for shipping in the Southern Red Sea and nearby areas. Yemen has been greatly damaged by a civil war that started in 2015. The Houthis took over parts of the country from the official government and a coalition led by Saudi Arabia got involved to try to take back control. The fighting has caused over 160,000 people to die and has led to a major humanitarian crisis. About 21 million people, which is two thirds of the population, need help in some way.