Earlier this year, federal agents somewhere in the western U.S. observed a mysterious triangular aircraft hovering over an unnamed site that’s sensitive to national security, according to new documents released by the Pentagon. The matte black craft was completely silent and zipped around as fast as a fighter jet, according to a witness, who described it as “resembling a delta wing drone.”

The craft was estimated to be somewhere between 13 and 15 feet in wingspan with a 6-9 foot fuselage length, according to the Department of Defense document made public Friday. The vertical thickness of the craft was estimated to be, at most, just one or two feet, according to the Department of Defense.

“The unidentified craft maintained a completely fixed horizontal alignment [which] did not tilt, sway, or wobble during the controlled vertical ascent of approximately ten seconds,” the DOD report explains. “It climbed to an altitude of an estimated 200 to 300 feet above the local ridge line. Upon reaching this altitude, the craft instantaneously arrested all vertical motion and entered a stable hover for an estimated twenty seconds.”

The craft then “transitioned from a zero-velocity state directly into high-speed horizontal flight,” and managed to execute “a fluid banking maneuver and terrain-hugging descent into a canyon drainage in approximately two to three seconds.” The report notes that once the craft was banking, its “silhouette appeared to flatten and present as a more triangle.”

The FBI report on the incident includes nine images , which feature landscape photos and a black triangle that moves when they’re viewed together as though part of a flipbook.

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