American officials investigating the UFO sightings by Navy pilots in recent years have not reached a definitive explanation for the unidentified aerial phenomena, or UAPs, as they’ve come to be known, two U.S. officials confirmed to ABC News – adding a new layer of mystery to the interstellar drama ahead of an upcoming report on the matter.

Investigators compiling a report to Congress due later this month are said to have found no evidence to suggest the UAPs are linked to alien spacecraft, nor are they in a position to explain what has been reported by U.S. military pilots in encounters over the years, the two officials said.

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