|I don't know whose it is, but it doesn't appear to belong to any news media outlets, which typically use bright-colored paint (especially red and blue) and network logos. When I see black and white, I think of Texas DPS, but I never got close enough to see any identifying marks on this one.|
So if you happen to be one of us stay-at-homes or work-at-homes and you see or hear this kind of event, check that your doors are secure, keep your cell phone handy, watch your email for a blast, and rove your eyeballs around outside of each of your house windows (all four sides) to see if there's anything weird going on in your immediate vicinity. Call the authorities if you see anything that is genuinely suspicious.
Not sure that any of us will ever know what today's event is all about, but there it is, FWIW.