The U.S. military is striking radar sites operated by Yemen’s Houthi rebels after a merchant sailor and boat went missing in the Red Sea earlier this week.

U.S. strikes have destroyed seven radars within Houthi territory, the military’s Central Command (CENTCOM) said. The Associated Press reported that the military did not elaborate on how the sites were destroyed and did not immediately respond to questions.

Separately, the U.S. destroyed two drone boats in the Red Sea that held bombs, as well as a drone that was launched above the waterway from the Houthi rebels.

CENTCOM acknowledged that one commercial sailor from the Liberian-flagged and Greek-owned cargo carrier Tutor has been missing since Wednesday, after the Houthis used a drone with a bomb on it to strike the boat.

The crew abandoned ship and were rescued by the USS Philippine Sea and partner forces, but the Tutor remains in the Red Sea and is "taking on water," the agency said, per the AP.