A bulk carrier sank days after an attack by Yemen’s Houthi rebels believed to have killed one mariner on board, authorities said early Wednesday, the second-such ship to be sunk in the rebel campaign.

The sinking of the Tutor in the Red Sea marks what appears to be a new escalation by the Iranian-backed Houthis in their campaign targeting shipping through the vital maritime corridor over the Israel-Hamas war in the Gaza Strip.

The attack comes despite a monthslong U.S.-led campaign in the…