Hmmmmm, a home made version of what the Isrealis use on the Palestineans....
Back in the 1960's, I read an SF story (in a monthly mag, I think) about a policeman trying to investigate random sporadic violent acts of similar ilk, but also including deliberate attacks on poeple. I can't remember the Author's name, but I am sure he was a 'big name'. Anybody know the story I am referring to?