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WASHINGTON — Mysterious black triangle objects speeding up to 1,800 miles per hour without vapor trails were spotted over secret US military bases on at least three separate occasions over the past year, a newly declassified tranche of government files on UFOs revealed Friday.

The sightings sparked national security concerns and it remains unclear if the objects were from other nations, according to redacted files on unidentified anomalous phenomena released Friday by the Trump Administration.

The triangle sightings raised concerns both for the advanced technology they appeared to use and for the location — over top secret sites where the US government tests new technology. The exact location and dates of the sightings were redacted for security reasons.

Sketches show mysterious black triangular objects spotted over secret U.S. military bases, according to a UFO file dump provided by the U.S. government.…