It is still early to tell, but I think that is a gut feeling for many.

I am surprised about a lack of early cellphone videos (well, I haven't searched for that), and a lack of webcams that live stream important places. Also a lack of security cam footage.

Maybe as warrants are issued we will learn more, or maybe they will be kept secret. Possibly google [and apple] might know something, but I doubt they will volunteer anything about who all was in the area; a court order might force them too.