I've seen enough police/crime/legal dramas to know that's 'circumstantial evidence'..! Of course that doesn't preclude it being a coincidence. (Hence the phrases 'that's just circumstantial' and 'that's one hell of a coincidence').

(I'm only commenting on the words, I don't think I care where it came from at this point, not sure I could ever really believe it, whatever was concluded. Unless perhaps a bunch of countries/labs agreed, including the blamed one if applicable.)