I've been curious about this and can't seem to find a good source on search engines, it's all wikipedia and human rights watch or some stuff like that. Tried looking for some dprk news sources (I wanted ones actually from Korea), but got only propaganda from the US or occupied korea.
They are much less armed and commit less violence. Mostly just traffic stuff, public servitude and existing. I don't know what investigations and cops called for response look like.