U.S. Central Command continued strikes against the group Sunday and Monday, launching a campaign that may last weeks, officials said.

The Iranian-backed rebels, who have targeted Israel and shipping in the Red Sea, said children were among those killed in the strikes ordered by President Trump.

Yemen's Houthi rebels say there have been fresh US strikes against them, with the number of dead rising to 53, including five children. Targets in the Al Jaouf and Hudaydah areas were hit early on Monday, according to the rebel group, while the US Central Command said its forces had continued operations.

Yemen's Houthis said on Tuesday they would expand their range of targets in Israel in the next hours and days unless the "aggression" on Gaza stops. The Iran-aligned group's military spokesperson Yahya Sarea also confirmed that they had targeted an air base in Israel with a ballistic missile.

Israeli warplanes pounded Gaza on Tuesday, killing hundreds of Palestinians in what is the first major attack since Israel and Hamas entered a fragile U.S.-backed cease-fire in January.