The director of the Pentagon's new unidentified flying object (UFO) office said that the United States government is tracking more than 650 potential cases of so-called "unidentified aerial phenomena," but the official also noted that there's no proof of aliens yet.

Pentagon: 'No credible evidence' of aliens yet, but tracking over 650 potential UFO cases

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Pentagon: 'No credible evidence' of aliens yet, but tracking over 650 potential UFO cases