This might have been a one-time thing, but if they bombers were nearby,
they could help but hear the impressive blast. People living 400 yards up the street heard it.
If they don't fear the police, they might keep on doing the same thing,
just to spread a little terror in the neighborhood.
I saw the stuff about people finding electronic devices (lights etc),
and switching them on to see if they worked.
That type of booby-trap is a little complicated compared to the bottle bomb.
Which makes me suspect they would be very rare.
But, since the bottle bomb is on YouTube and the components are in most kitchens,
these things are going to be with us for years..
Water Bottle Bomb Up Close - YouTube