U.S. airstrikes targeting Yemen’s Houthi rebels pounded sites across the country into Monday, with the group saying the one attack in the capital killed at least one person and wounded more than a dozen others.

The American strikes entered its 10th day without a sign of stopping, part of a campaign by U.S. President Donald Trump targeting the rebel group that threatens maritime trade and Israel while also trying to pressure Iran, the Houthis’ main benefactor.

So far, the U.S. has not offered any specifics on the sites it is striking, though Trump’s national security adviser Mike Waltz claimed the attacks have “taken out key Houthi leadership, including their head missileer.” That’s something so far that’s not been acknowledged by the Houthis, though the rebels have downplayed their losses in the past and exaggerated their attacks attempting to target American warships.

“We’ve hit their headquarters,” Waltz told CBS’ “Face the Nation” on Sunday. “We’ve hit communications nodes, weapons factories and even some of their over-the-water drone production facilities.”

An apparent U.S. strike Sunday hit a building in a western neighborhood of Yemen’s capital, Sanaa, killing at least one person and wounding 13 others, the rebel-controlled SABA news agency said, citing health officials. Footage released by the rebels showed the rubble of a collapsed building and pools of blood staining the gray dust covering the ground.

A building next to the collapsed structure still stood, suggesting American forces likely used a lower-yield warhead in the strike.