The Iranian Navy said it had seized an oil tanker off the coast of Oman that has been at the center of a dispute between Tehran and Washington, raising the stakes as a U.S.-led coalition launched strikes on rebel targets in Yemen.

The seizure came as Secretary of State Antony Blinken wrapped up a weeklong tour of the region aimed at cooling tensions there, especially in the waters of the Middle East, where attacks have risen since the Israel-Hamas war began.