Just my opinion...,
but I see several likely possibilities here. First, it could be more than one person, but I'm starting to doubt it, just isn't as likely, but I definitely don't discount that it could be more than one person, and I'll keep it filed in the back of my mind. Two, whoever is doing this, must be getting pretty desperate to be saturating the area with multiple incidents, and this is not good for anyone but LE. Three, just like the DC snipers, if they become aware that LE is looking into or concentrating on the area of that "cluster" of incidents, they may decide to expand their "territory", and the media is famous (or infamous) for pointing this out. They could be coming "to a location near you!"
The point is, I believe that this person or persons will continue until they are caught. I don't believe they're going to get scared and stop outright, and all of us (especially with kids) need to be hyper aware and take notes (literally) of anything we feel that "just seems odd". Sometimes cases turn, or begin to be solved on the smallest (and often overlooked for whatever reason) bit of information. Write it down somewhere while it's still fresh in your mind and save it until you're satisfied that it may be useful or not..., and then keep it around for a while longer.
sidestreet
Jeremiah 29 vs. 11-13
we are not equal, we will never be equal, but we must be relentless.