Mysterious "flying triangle" sighting leads new government release of UFO documents

On a recent evening near a secure U.S. facility, three federal agents saw a flying object they couldn't identify: a large "matte black triangle" that moved as fast as a fighter jet, made no sound and then disappeared, according to FBI and Defense Department reports. Why it matters: The 15-foot flying triangle is classified as a UFO-like "Unidentified Anomalous Phenomena" because the U.S. doesn't have the technology to make such a craft — and neither do its adversaries. The reports of the drone-like aircraft is of growing interest and concern to intelligence and military officials. Driving the news: The two reports about the mysterious triangle were included in a batch of 10 documents released Friday by U.S. officials under President Trump's order this year to disclose UAP records from all government sources as soon as possible. Friday's disclosure marks the seventh release of a tranche of documents under the order. Some of the documents found in the National Archives are from the 1940s. Zoom in: The flying triangle reports are the most intriguing because the incident — from this year — is so recent. The month and day are redacted. The FBI document is labeled an "Unidentified Aerial Object Observation Report" and the Defense Department 's report on it is classified as a "Unidentified Anomalous Phenomena" report. The observers were federal agents, including two with "extensive operational experience" and familiarity with drones. One had a "thermal monocular" for infrared tracking and yet couldn't detect "discrete heat sources associated with propulsion" from an engine on the mysterious craft. The agents reported seeing the drone-like triangle, with a wingspan of about 15 feet, rise vertically for as many as 300 feet above a mountain ridgeline without tilting or swaying. It stopped, hovered for about 20 seconds, and then flew horizontally as fast as a fighter jet for about 1.5 miles in three seconds without making a sound before it vanished. The intrigue: One of the do