As reported by my local CBS / KCAL news.
3 Boy Scouts Accused Of Blowing Up Car down in Redondo. Now, I never been in the boysouts but last time I checked I think PipeBomb Making is not a badge you earn. So, I am not sure if they were working on extra credit or something.
the boys set the bomb off as a prank. He said it ignited the car, blew a hole through a nearby wooden garage door and damaged a cinderblock wall across the alley.