This is the worst killing spree that ever happened in Serbia... and all killed people were killers family, closer or distant... he killed his mother, soon, his wife is fighting for life, his son's wife and her mother... 2 year old kid... few more cousins... he just went from house to house, 5 houses total... and that was very very small place, everyone new each other and no one had habbit of locking the door. Something just clicked in this guys head. he had no police record, no medical record or mental illness. Even after everything happend his neighbours and even son of one of the victims said that he doesn't believe what happened because killer was up to that moment great guy, great friend and neighbour and no one believed that he can even hurt a fly.
We only had two mass shootings here, few years ago man killed 7 people and in 2002. guy killed 9 people.
I'm affraid that with fast way of life, shortage of money and hard life, medical issues and ton of other things, this kind of stuff will start to happen more and more.