The U.S. military struck facilities in Iraq and Yemen operated by Iranian-backed militias that are said to be involved in attacks against U.S. forces in Iraq and Syria.
The strikes were launched from the Red Sea and hit more than a dozen sites. They follow an announcement that the U.S. has put the Houthis back on its list of specially designated global terrorists.
The airstrikes on multiple Houthi targets in Yemen follow more than two months of attacks by the Iran-backed militants against cargo ships and U.S. warships in the Red Sea.
Drones and missiles targeted shipping in the sea, but ships from the U.S. and British navies shot down the projectiles. No damage was reported. The rebels say they aim to stop Israel's war on Hamas.
Yemen's Iran-backed Houthi rebels launched a series of attacks on vessels in the Red Sea, as well as launching drones and missiles targeting Israel as it wages war against Hamas in the Gaza Strip.
Armed assailants seized and later let go of a tanker linked to Israel off the coast of Yemen on Sunday before being apprehended by the United States Navy.
The Pentagon said its forces in the Middle East were seeing an 'uptick' in drone activity at a time when the U.S. is on high alert for signs the Israel-Hamas conflict could escalate across the region.