DUBAI, United Arab Emirates (AP) — An American guided-missile destroyer was gashed and dented on one side in a collision with an oil tanker early Sunday just outside the strategic Strait of Hormuz.

The collision tore a hole about 10 feet by 10 feet in the right side of the destroyer, the Porter, above the water line. No one on the Porter or the other vessel, a Japanese-owned bulk oil carrier called the Otowasan, was hurt, the Navy said in a statement.

The Navy said that the collision, which happened about 1 a.m., was not “combat related,” but that its cause had not been determined. Greg Raelson, a spokesman for the Navy, said Sunday afternoon that the destroyer had reached port in Jebel Ali, Dubai.