WASHINGTON (AP) — The U.S. military fired another wave of ship and submarine missile strikes against Houthi-controlled sites on Wednesday, several U.S. officials said, in the wake of the Israel-Hamas war continuing to spread in the Middle East east.

The attacks were launched from the Red Sea and hit more than a dozen locations, the officials said. The attacks followed an official announcement on Wednesday that the US had placed the Houthis back on its list of specially designated global terrorists. The sanctions associated with the formal designation are intended to cut off violent extremist groups from their sources of funding.

The officials spoke on condition of anonymity to discuss details that have not yet been released.

The Houthi-run channel al-Masirah TV said on Telegram that the attacks targeted the governorates of Dhamar, Hodieda, Taiz, al-Bayda and Saada.

Despite sanctions and military strikes, including a large-scale operation by American and British warships and fighter jets on Friday that hit more than 60 targets across Yemen, the Houthis are continuing their campaign of harassment against commercial and military vessels. The latest incident occurred on Wednesday when a disposable attack drone was launched from a Houthi-controlled area in Yemen and struck the Marshall Islands-flagged, US-operated MS Genco Picardy in the Gulf of Aden.

The US has also strongly warned Iran to stop supplying arms to the Houthis. On Thursday, a U.S. attack on a dhow intercepted parts of ballistic missiles that the U.S. said Iran was shipping to Yemen. Two US Navy SEALs remain missing after one was thrown from the ship by a wave during the seizure and the second followed the overwhelmed SEAL into the water.

On Wednesday, Pentagon press secretary Maj. Gen. Pat Ryder said the U.S. would continue to take military action to prevent further attacks.

“They are taking advantage of this situation to carry out attacks on ships from more than 50 countries… around the world. “That’s why we will continue to work with our partners in the region to prevent or deter these attacks in the future,” Ryder said.

There have been several incidents since the joint operations on Friday. The Houthis fired an anti-ship cruise missile at a U.S. Navy destroyer over the weekend, but the ship shot it down. The Houthis then attacked a US ship in the Gulf of Aden on Monday and a Malta-flagged bulk carrier in the Red Sea on Tuesday. In response, the U.S. fired on four ready-to-launch anti-ship missiles on Tuesday, posing an imminent threat to merchant and U.S. Navy ships in the region.

Hours later, the Houthis claimed responsibility for the attack on the Malta-flagged bulk carrier Zografia. The ship was hit, but no one was injured and it continued its journey.

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Associated Press writers Aamer Madhani and Ellen Knickmeyer contributed from Washington.