The Pentagon’s UFO office has received more than 700 reports, a newly declassified assessment reveals. It’s a dramatic increase in witness sightings and accounts that adds to a growing list and comes as former Defense Department officials claim the U.

A former Pentagon official testified to Congress that the U.S. government has evidence that "we are not alone in the cosmos," but that a "cabal" of officials is hiding the information.

Ex-government and military officials testify in the latest congressional hearing on the mysterious phenomena, which have long fascinated the public.