Crossword Genius

Sightings of them can be reported on the Enigma app (4)

Ross

I believe the answer is:

ufos

(Other definitions for ufos that I've seen before include "Mysterious things" , "Strange aerial objects" , "Mysterious phenomena" , "Initially, official flying saucers" , "Initially, formal flying saucers" .)

I've seen this clue in The New York Times.
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