My first though as well. OWS, ELF or anarchist types. Or just some deranged pyromaniacs.
Normally I would be the first to think it was some far left OWS freak, but the areas they are targeting, are not wealthy areas..when you think of North Hollywood, you don’t think “Rich” these people are not wealthy. Im thinking some deranged person who might have gotten evicted from an apartment recently and is getting revenge.