The aircraft carrier of the USS Harry S. Truman collided with a merchant ship near the harbor, said off the coast of Egypt, the navy said.
The shock collision took place late on Wednesday evening when both ships sailed in the waters near the harbor, but the incident caused no damage.
The navy said there are no reports of floods or injuries as a result of the crash, and there was no damage to the drive systems of the aircraft carrier, the military branch said in a statement.
A defense officer said the independent that the merchant ship, the 617 Voet Besiktas-M, was also not damaged in the incident and none of his crew was injured.
It is not clear what caused the collision and the army has started an investigation, but an official told CNN that it took place in an area near the Suez Canal that often sees pressure saturation traffic.
The nuclear powered, 1,100-foot USS Harry S. Truman is usually located in Virginia, but was used in the Mediterranean Sea and the Middle East in September.
The last harbor call before the collision was reportedly in Souda Bay, Greece.

The aircraft carrier of the USS Harry S. Truman collided with a merchant ship near the harbor, said on Wednesday off the coast of Egypt on Wednesday
The Besiktas-M, which sails with the Panamanian flag, had sailed through the Suez Canal shortly before the collision.
The ship was on a route to Romania before the incident, according to the Marine traffic shipping website.
At the same time, the USS Harry S. Truman sailed to the Suez Canal when it crossed the courses with the merchant ship.
Former American Navy captain Carl Schuster, an instructor at Hawaii Pacific University, told CNN that heavy shipping traffic around the Suez Canal could not leave little margin for errors.
“There is not much room to maneuver in a limited sea road and both ships require about one nautical mile to stop,” Schuster said.