Anyone with a good lawyer would argue this is circumstantial evidence, and considering the large volume of felonious criminals in the area, it wouldn't be above them to spoof the cell signals to frame anyone they wanted. Considering the government those rioters were attempting to overthrow is also in heavy possession of electronic devices to spoof cellular signals, the FBI/CIA/NSA could have framed them.
The important thing to remember with intelligence agencies and a principle of omniscience itself is that if you could see literally all crimes being committed in an area and who is doing them, not only would you be horrified and trust no one ever again but you would immediately be forced to reevaluate what constitutes a “serious” crime worth pursuing
