[elorant]

I don't think parent comment was about confiscating phones rather than identifying which phones were in the area during the infiltration. If you can sort out the ones who had reason for being there, everyone else is a possible culprit.

[pvarangot]

Legally getting that information from cellphone towers or tech companies and then acting on it would take at least one week, even if they had killed multiple people. A three letter agency could probably get it clandestinely and act para-legally for example putting people on surveillance or getting a flash arrest warrant for an unrelated but quickly to parallel-construct crime, but I don't see that happening in this case.

If there's going to be arrests based on cellphone tower or mobile app data I would expect them to happen by the end of next week.