"the safety of a citizen witness." Someone was interviewed who is apparently identified in the search warrant (or could be from the information given). It's just a way of saying that, since the investigation isn't over, if there were anyone else they came to suspect of being involved, they wouldn't want that individual to know who the witness was.
When we try to pick out anything by itself, we find it hitched to everything else in the Universe.
~ John Muir
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