I was wondering when this sort of thing would start. Yes it is terrorist attack. The motivation seems to be to use the tactics of Jihadist attackers against their own communities. I have been scared of this possibility but hoped I was just paranoid.
While Islamic terrorists are motivated by their desire to punish “Infidels” and those they believe are oppressing Muslims, this sort of terrorist appears to be motivated by his feeling of betrayal of Government to effectively address the radicals in their society. People start feeling powerless and fearful and betrayed by their Government
This is just my opinion but I believe this will turn out to be true.