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Waves of attacks by the Iran-backed Houthi group in Yemen may not be targeting U.S. warships, even though the U.S. Navy has responded by shooting down drone aircraft and missiles in recent weeks, the Pentagon said on Monday.

The United States has blamed the Houthis for a series of attacks in Middle Eastern waters since Israel began its war on Gaza.

In the latest incidents, three commercial vessels came under attack in international waters in the southern Red Sea on Sunday. The Houthis acknowledged launching drone and missile attacks against what they said were two Israeli vessels in the area.

The Carney, a U.S. Navy destroyer, shot down three drones on Sunday as it answered distress calls from the commercial vessels. The U.S. military says the three vessels were connected to 14 separate nations.

"The Carney took action as a drone was headed in its direction. But again, we can't assess that the Carney at this time was the intended target," said Pentagon spokesperson Sabrina Singh.

The United States and Britain have condemned the attacks on commercial shipping in the Red Sea, blaming Iran for its role in supporting the Houthi militants behind them.

The Houthi group, which controls most of Yemen's Red Sea coast, had previously fired ballistic missiles and armed drones toward Israel and vowed to target more Israeli vessels.

U.S. national security officials are concerned about the risk of a sudden, deadly regional escalation as the Israel-Hamas war rages, given the Houthi attacks in the Red Sea and separate attacks by Iran-backed militia against U.S. troops in Iraq and Syria.

The Pentagon said it killed five militants in Iraq on Sunday as they prepared to attack U.S. troops with a drone.

Singh stopped short of using language that could suggest any imminent U.S. retaliation against the Houthis.

"There have certainly been irresponsible actions taken by the Houthis, especially when it comes to targeting commercial vessels that are transiting international waters," she said.

Asked if the United States might retaliate, Singh said: "If we decide to take action against the Houthis, it will of course be at a time and place of our choosing.

"I won't get ahead of the (defense) secretary. I won't go ahead of the president on any actions. But we always reserve the right to respond," Singh said.

At the White House, President Joe Biden's national security adviser told reporters that talks were ongoing about a maritime task force "of sorts" to ensure the safe passage of ships in the Red Sea.

White House national security adviser Jake Sullivan declined to say what the exact structure would look like and it if would be a part of a multinational task force that already exists and focuses on maritime security efforts in the Red Sea, Bab al-Mandeb and Gulf of Aden.

"At a broad level the idea that we would work with other countries and their naval vessels to try to provide a greater level of security through the Red Sea, that's something that we're actively discussing with our colleagues," Sullivan said.

Sullivan's comments could suggest that the focus is on policing the waterway rather than retaliatory measures.