New Pentagon UFO Files Detail FBI Agents’ Sighting of Silent Triangle With No Visible Engines

Newly released Department of War documents say FBI agents saw a mysterious black triangular object hovering silently over a mountain ridge before it accelerated suddenly at a speed they compared with that of a fighter jet.

The 2026 sighting is one of several incidents described in the records examining unidentified anomalous phenomena, or UAPs. The files also include decades-old military encounters, reports of mysterious creatures and unexplained lights, as well as alleged portals at a Utah ranch.

In the FBI account, the object was described as dark, nonreflective and triangular, with a shape similar to a drone. Witnesses estimated its wingspan at 9 to 15 feet and observed no exhaust or recognizable propulsion system.

The agents said the object rose vertically above the ridgeline, then sped into a canyon without producing any sound.

A separate report from the Pentagon’s All-domain Anomaly Resolution Office, or AARO, offers additional details about the encounter. The office is responsible for investigating reports of unidentified anomalous phenomena.

According to the AARO report, the matte-black triangular object climbed approximately 200 to 300 feet above the ridgeline and hovered for about 20 seconds. It then appeared to accelerate almost instantly, vanishing into a canyon within two to three seconds.

The witnesses reported seeing no engines, rotors, exhaust or other conventional features associated with an aircraft.

Using handheld thermal equipment, the agents also said they detected a consistent heat signature across the object’s surface rather than the concentrated hot spots typically linked to propulsion systems.

The Pentagon cautioned that the object’s speed was estimated by the witnesses and was not recorded by instruments.

The FBI and AARO accounts also differ over the duration of the sighting. The FBI report places the encounter at approximately three seconds, while the AARO account describes about 10 seconds of ascent, 20 seconds of hovering and an additional two to three seconds of rapid movement before the object disappeared.

Neither report determines what the object was or where it originated.

News Media has asked AARO for comment on the sighting, including whether investigators have identified the object and whether the images released with the FBI report depict the actual encounter or are illustrations.

The newly released records also contain an Air Force intelligence report dated Jan. 19, 1957. It details an unidentified radar contact involving a U.S. B-52 bomber during a Strategic Air Command mission near Saudi Arabia.

The bomber was flying at approximately 39,000 feet when its radar detected an unidentified target about 6,000 yards away on Jan. 18, 1957.

The radar contact remained visible for five to seven minutes before disappearing as the bomber made a left turn.

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Air Force investigators said no other aircraft were expected in the area, while acknowledging that the contact may have vanished because the bomber changed direction.

Additional historical records describe reported sightings near California’s Santa Catalina Island.

In one case, three Boy Scouts attending summer camp reported seeing a silent, silver object moving faster than a conventional jet while hiking on the island June 25, 1952.

The scouts claimed the object made a climbing turn before appearing to disintegrate, an Air Force intelligence report states.

Investigators noted that the scouts had no instruments to measure its speed or altitude and that their limited experience made it difficult to assess the reliability of their account.

A separate March 15, 1955, report describes a witness near Avalon on Catalina Island who spotted a bright, round object that changed from orange to red before falling straight down.

The Air Force ultimately classified the sighting as a “probable meteor.”

The files also include a 60-page investigation conducted in 2010 by Bigelow Aerospace Advanced Space Studies (BAASS) at a Utah ranch associated with reports of unexplained phenomena.

Investigators interviewed residents who described towering dog-like creatures walking on two legs, mysterious balls of light and other unusual sightings.

Other witnesses reported smaller, hairy creatures, a prehistoric-looking bird and a worm allegedly measuring 8 feet long. One witness also described a transparent, rippling structure she believed was a portal to another world.

The investigation included eyewitness sketches, surveillance cameras, environmental monitoring and hair samples collected from areas associated with reported creature sightings.

Laboratory testing, however, identified the hair samples as coming from ordinary animals, including domestic dogs and a raccoon.

The report did not establish the existence of the alleged creatures or other extraordinary phenomena.

News Media reached out to the FBI for comment.