Bit concerning that no government agencies have figured out what’s going on, but hardly seems like there is a reason for a limited state of emergency given there is no known threat at all. My guess is a US company is gathering data and hasn’t admitted to do so without some type of licensing/etc
I wouldn't be betting against this being a government agency. Anywhere between local cops and black/budgetless agencies you'd go to jail for even having heard of.
That, or maybe organised crime. A friend of mine used to have what turned out to be a high level drug dealer living/working a few doors up the street. They'd fly DJI drones off the balcony and hover them where they could monitor the roads leading in and out of the area, presumably watching for cops. One night an unexpectedly large amount of unmarked cars all converged on that property, followed about 90 seconds later by about a dozen fully lit up and sirening cop cars. The occupants of the first batch of unmarked cars swept up about 8 people running away when the lit up marked cars turned into the street.