U.S. B-2 bombers and other aircraft struck five underground Houthi weapons storage locations in parts of Yemen that the Iranian-backed rebel group controls, Defense Secretary Lloyd Austin said Wednesday.

The facilities, which officials said were hardened, housed “various weapons components of types that the Houthis have used to target civilian and military vessels throughout the region,” Austin said.

Houthi rebels, backed by Iran, have attacked civilian vessels in the Red Sea and the Gulf of…