The U.S. Navy says a Pearl Harbor-based submarine was damaged when a periscope struck an unidentified vessel in the Persian Gulf.
U.S. Naval Forces Central Command says in a statement that no one was hurt in the pre-dawn incident Thursday involving the USS Jacksonville.
The submarine surfaced from periscope depth to see if the collision damaged the vessel, but the ship continued "on a consistent course" offering no indication of distress or acknowledgement of a collision.
The Navy says one of the Jacksonville's two periscopes was damaged.
The Navy says a P-3 Orion aircraft searched the area but saw no debris in the water or vessels in distress.
The Jacksonville is currently deployed to the Middle East.