NEW : The shooting suspect is a war veteran who never seemed violent , a broadcaster reports . The suspect goes house to house , killing occupants ; six women , six men and one child die . Murder is rare in Afghanistan , according to the World Health Organization .
NEW : The shooting suspect is a war veteran who never seemed violent , a broadcaster reports . The man goes house to house , killing occupants ; six women , six men and one child die . Murder is rare in Serbia , according to the World Health Organization .