The Pentagon confirmed that two US warships and a fighter jet encountered an unidentified flying object (UFO) that was “unlike any other aircraft” in the world.

The US Department of Defense released a 13-page report on the UFO encounter off the coast of San Francisco.

The aircraft carrier USS Nimitz and escort ships in the carrier strike group played a “cat and mouse” game with UFOs for 6 days in November 2004.

The destroyer USS Princeton reported multiple UFO sightings. The F-18 fighter then took off to pursue the mysterious object.

The Pentagon’s report said that the mysterious object is about 14 meters long, “whole body is white, very smooth and has no edges”. The US Navy’s most modern surveillance and tracking systems cannot detect this object’s signal.

Evidence of a UFO encounter on the aircraft carrier USS Nimitz was leaked. Commander David Fravor said the object was “unlike any other aircraft” in the world.

The Pentagon report was published by a Las Vegas television channel and was verified by four different sources.

The report was revealed as part of the Pentagon’s program to verify UFO encounters. F-18 fighter pilots took turns answering questions from investigators, along with radar system operators of the aircraft carrier strike group, including the submarine USS Louisville.

Pentagon officials said the UFO was unlike any other aircraft in the world, capable of “disabling the US Navy’s radar system”.

The UFO also has remarkable acceleration thanks to its “modern aerodynamic” design and even has an “invisibility at a glance” device.

This UFO can even “dive into the sea like a submarine and be completely undetected by sensor systems”.

US navy personnel said the UFO even suddenly dropped in altitude from “several tens of kilometers to several hundred meters in just a few seconds”. This helps the mysterious object escape the pursuit of F-18 attack ships.

Commander Fravor once responded to the incident on CNN: “The UFO has no wings, making people think it is a helicopter. But the way it operates is not at all like a helicopter.”

“I have never seen anything that can fly so flexibly. It can suddenly accelerate and disappear after just a few seconds.”

It is unclear whether this mysterious object is a foreign experimental aircraft, imagined by US naval personnel, or if it really comes from another world.